diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbb44a80..87fe2343 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 ### Added
 - Context receivers flag
 - MeshLine for thick lines
+- Custom client-side events and thier processing in VisionServer
 
 ### Changed
 - Color accessor property is now `colorProperty`. Color uses `invoke` instead of `set`
diff --git a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt
index c81ca577..ba3e4616 100644
--- a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt
+++ b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt
@@ -3,6 +3,7 @@ package ru.mipt.npm.root
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.double
 import space.kscience.dataforge.meta.int
+import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.parseAsName
 import space.kscience.dataforge.names.plus
@@ -12,7 +13,6 @@ import space.kscience.kmath.geometry.fromRotationMatrix
 import space.kscience.kmath.linear.VirtualMatrix
 import space.kscience.visionforge.MutableVisionContainer
 import space.kscience.visionforge.isEmpty
-import space.kscience.visionforge.set
 import space.kscience.visionforge.solid.*
 import space.kscience.visionforge.solid.SolidMaterial.Companion.MATERIAL_COLOR_KEY
 import kotlin.math.PI
@@ -188,7 +188,7 @@ private fun SolidGroup.addShape(
         }
 
         "TGeoPgon" -> {
-            //TODO add a inner polygone layer
+
             val fDphi by shape.meta.double(0.0)
             val fNz by shape.meta.int(2)
             val fPhi1 by shape.meta.double(360.0)
@@ -201,19 +201,26 @@ private fun SolidGroup.addShape(
             val startphi = degToRad(fPhi1)
             val deltaphi = degToRad(fDphi)
 
-            extruded(name) {
+            fun Shape2DBuilder.pGon(radius: Double){
+                (0..<fNedges).forEach {
+                    val phi = deltaphi / fNedges * it + startphi
+                    point(radius * cos(phi), radius * sin(phi))
+                }
+            }
+
+            surface(name) {
                 //getting the radius of first
                 require(fNz > 1) { "The polyhedron geometry requires at least two planes" }
-                val baseRadius = fRmax[0]
-                shape {
-                    (0..<fNedges).forEach {
-                        val phi = deltaphi / fNedges * it + startphi
-                        point(baseRadius * cos(phi), baseRadius * sin(phi))
-                    }
-                }
-                (0 until fNz).forEach { index ->
-                    //scaling all radii relative to first layer radius
-                    layer(fZ[index], scale = fRmax[index] / baseRadius)
+                for (index in 0 until fNz){
+                    layer(
+                        fZ[index],
+                        innerBuilder = {
+                            pGon(fRmin[index])
+                        },
+                        outerBuilder = {
+                            pGon(fRmax[index])
+                        }
+                    )
                 }
             }.apply(block)
         }
diff --git a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt
index c443f646..e3cf446c 100644
--- a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt
+++ b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt
@@ -12,6 +12,7 @@ import kotlinx.serialization.modules.polymorphic
 import kotlinx.serialization.modules.subclass
 
 
+@Suppress("UNUSED_PARAMETER")
 private fun <T> jsonRootDeserializer(
     tSerializer: KSerializer<T>,
     builder: (JsonElement) -> T,
@@ -83,7 +84,7 @@ private object RootDecoder {
 
             return ref.getOrPutValue {
 //                println("Decoding $it")
-                val actualTypeName = it.jsonObject["_typename"]?.jsonPrimitive?.content
+//                val actualTypeName = it.jsonObject["_typename"]?.jsonPrimitive?.content
                 input.json.decodeFromJsonElement(tSerializer, it)
             }
         }
diff --git a/demo/gdml/src/commonTest/kotlin/space/kscience/visionforge/gdml/GDMLVisionTest.kt b/demo/gdml/src/commonTest/kotlin/space/kscience/visionforge/gdml/GDMLVisionTest.kt
index 294af3ee..ba9cb333 100644
--- a/demo/gdml/src/commonTest/kotlin/space/kscience/visionforge/gdml/GDMLVisionTest.kt
+++ b/demo/gdml/src/commonTest/kotlin/space/kscience/visionforge/gdml/GDMLVisionTest.kt
@@ -34,6 +34,6 @@ class GDMLVisionTest {
         val child = cubes[Name.of("composite-000","segment-0")]
         assertNotNull(child)
         child.properties.setValue(SolidMaterial.MATERIAL_COLOR_KEY, "red".asValue())
-        assertEquals("red", child.properties.getProperty(SolidMaterial.MATERIAL_COLOR_KEY).string)
+        assertEquals("red", child.properties.getMeta(SolidMaterial.MATERIAL_COLOR_KEY).string)
     }
 }
\ No newline at end of file
diff --git a/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt b/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt
index f11c9e01..2cc8e9a5 100644
--- a/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt
+++ b/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt
@@ -69,7 +69,7 @@ class Model(val manager: VisionManager) {
 
     fun reset() {
         map.values.forEach {
-            it.properties.setProperty(SolidMaterial.MATERIAL_COLOR_KEY, null)
+            it.properties.setMeta(SolidMaterial.MATERIAL_COLOR_KEY, null)
         }
         tracks.children.clear()
     }
diff --git a/demo/playground/src/jvmMain/kotlin/antenna.kt b/demo/playground/src/jvmMain/kotlin/antenna.kt
index 5ec997f7..5080e939 100644
--- a/demo/playground/src/jvmMain/kotlin/antenna.kt
+++ b/demo/playground/src/jvmMain/kotlin/antenna.kt
@@ -75,7 +75,7 @@ fun main() = serve {
             val incRot = Quaternion.fromRotation(30.degrees, Euclidean3DSpace.zAxis)
 
 
-            val rotationJob = context.launch {
+            context.launch {
                 var time: Long = 0L
                 while (isActive) {
                     with(QuaternionField) {
diff --git a/demo/playground/src/jvmMain/kotlin/extruded.kt b/demo/playground/src/jvmMain/kotlin/extruded.kt
index 8a25549f..c45b2564 100644
--- a/demo/playground/src/jvmMain/kotlin/extruded.kt
+++ b/demo/playground/src/jvmMain/kotlin/extruded.kt
@@ -12,9 +12,10 @@ fun main() = makeVisionFile {
             extruded("extruded") {
                 shape{
                     polygon(8, 100)
-                    layer(-30)
-                    layer(30)
                 }
+                layer(-30)
+                layer(0, x = 10, y = 10)
+                layer(30)
             }
         }
     }
diff --git a/demo/playground/src/jvmMain/kotlin/surface.kt b/demo/playground/src/jvmMain/kotlin/surface.kt
new file mode 100644
index 00000000..01fbfb50
--- /dev/null
+++ b/demo/playground/src/jvmMain/kotlin/surface.kt
@@ -0,0 +1,19 @@
+package space.kscience.visionforge.examples
+
+import space.kscience.visionforge.solid.ambientLight
+import space.kscience.visionforge.solid.polygon
+import space.kscience.visionforge.solid.solid
+import space.kscience.visionforge.solid.surface
+
+fun main() = makeVisionFile {
+    vision("canvas") {
+        solid {
+            ambientLight()
+            surface("surface") {
+                layer(0, { polygon(8, 10) }, { polygon(8, 20) })
+                layer(10, { polygon(8, 20) }, { polygon(8, 30) })
+                layer(20, { polygon(8, 10) }, { polygon(8, 20) })
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index e65394ef..dc7d1342 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,7 +1,7 @@
 kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
 kotlin.js.compiler=ir
-kotlin.incremental.js.ir=true
+#kotlin.incremental.js.ir=true
 
 org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx4G
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/AbstractVision.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/AbstractVision.kt
index e7df2198..0cba6a37 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/AbstractVision.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/AbstractVision.kt
@@ -3,7 +3,7 @@ package space.kscience.visionforge
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.MutableMeta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 
 
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/StyleSheet.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/StyleSheet.kt
index 7320839d..00213644 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/StyleSheet.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/StyleSheet.kt
@@ -13,7 +13,7 @@ import kotlin.jvm.JvmInline
 @JvmInline
 public value class StyleSheet(private val owner: Vision) {
 
-    private val styleNode: Meta get() = owner.properties.getProperty(STYLESHEET_KEY)
+    private val styleNode: Meta get() = owner.properties.getMeta(STYLESHEET_KEY)
 
     public val items: Map<NameToken, Meta> get() = styleNode.items
 
@@ -23,7 +23,7 @@ public value class StyleSheet(private val owner: Vision) {
      * Define a style without notifying owner
      */
     public fun define(key: String, style: Meta?) {
-        owner.properties.setProperty(STYLESHEET_KEY + key, style)
+        owner.properties.setMeta(STYLESHEET_KEY + key, style)
     }
 
     /**
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
index ce5f588f..31ff307e 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/Vision.kt
@@ -37,6 +37,9 @@ public interface Vision : Described {
      * Update this vision using a dif represented by [VisionChange].
      */
     public fun update(change: VisionChange) {
+        if (change.children?.isNotEmpty() == true) {
+            error("Vision is not a group")
+        }
         change.properties?.let {
             updateProperties(it, Name.EMPTY)
         }
@@ -67,7 +70,7 @@ public var Vision.visible: Boolean?
  */
 public fun Vision.onPropertyChange(
     scope: CoroutineScope? = manager?.context,
-    callback: suspend (Name) -> Unit
+    callback: suspend (Name) -> Unit,
 ): Job = properties.changes.onEach {
     callback(it)
 }.launchIn(scope ?: error("Orphan Vision can't observe properties"))
\ No newline at end of file
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChange.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChangeBuilder.kt
similarity index 84%
rename from visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChange.kt
rename to visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChangeBuilder.kt
index 847368f3..5b143023 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChange.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionChangeBuilder.kt
@@ -1,15 +1,15 @@
 package space.kscience.visionforge
 
-import kotlinx.coroutines.*
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
-import kotlinx.serialization.Serializable
 import space.kscience.dataforge.meta.*
-import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.isEmpty
 import space.kscience.dataforge.names.plus
@@ -27,22 +27,6 @@ private fun Vision.deepCopy(manager: VisionManager): Vision {
     return manager.decodeFromJson(json)
 }
 
-/**
- * A vision used only in change propagation and showing that the target should be removed
- */
-@Serializable
-public object NullVision : Vision {
-    override var parent: Vision?
-        get() = null
-        set(_) {
-            error("Can't set parent for null vision")
-        }
-
-    override val properties: MutableVisionProperties get() = error("Can't get properties of `NullVision`")
-
-    override val descriptor: MetaDescriptor? = null
-}
-
 
 /**
  * An update for a [Vision]
@@ -111,18 +95,6 @@ public class VisionChangeBuilder : MutableVisionContainer<Vision> {
     )
 }
 
-/**
- * @param vision a new value for vision content. If the Vision is to be removed should be [NullVision]
- * @param properties updated properties
- * @param children a map of children changed in ths [VisionChange]. If a child to be removed, set [delete] flag to true.
- */
-@Serializable
-public data class VisionChange(
-    public val vision: Vision? = null,
-    public val properties: Meta? = null,
-    public val children: Map<Name, VisionChange>? = null,
-)
-
 public inline fun VisionManager.VisionChange(block: VisionChangeBuilder.() -> Unit): VisionChange =
     VisionChangeBuilder().apply(block).deepCopy(this)
 
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionEvent.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionEvent.kt
new file mode 100644
index 00000000..3f86a2c0
--- /dev/null
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionEvent.kt
@@ -0,0 +1,52 @@
+package space.kscience.visionforge
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.names.Name
+
+/**
+ * An event propagated from client to a server
+ */
+@Serializable
+public sealed interface VisionEvent
+
+/**
+ * An event that consists of custom meta
+ */
+@Serializable
+@SerialName("meta")
+public class VisionMetaEvent(public val targetName: Name, public val meta: Meta) : VisionEvent
+
+
+/**
+ * A vision used only in change propagation and showing that the target should be removed
+ */
+@Serializable
+@SerialName("null")
+public object NullVision : Vision {
+    override var parent: Vision?
+        get() = null
+        set(_) {
+            error("Can't set parent for null vision")
+        }
+
+    override val properties: MutableVisionProperties get() = error("Can't get properties of `NullVision`")
+
+    override val descriptor: MetaDescriptor? = null
+}
+
+
+/**
+ * @param vision a new value for vision content. If the Vision is to be removed should be [NullVision]
+ * @param properties updated properties
+ * @param children a map of children changed in ths [VisionChange].
+ */
+@Serializable
+@SerialName("change")
+public data class VisionChange(
+    public val vision: Vision? = null,
+    public val properties: Meta? = null,
+    public val children: Map<Name, VisionChange>? = null,
+) : VisionEvent
\ No newline at end of file
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionGroup.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionGroup.kt
index 8a651ffc..fd8aaa16 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionGroup.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionGroup.kt
@@ -10,11 +10,25 @@ import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.names.parseAsName
 import space.kscience.dataforge.names.plus
+import space.kscience.visionforge.AbstractVisionGroup.Companion.updateProperties
 import space.kscience.visionforge.Vision.Companion.STYLE_KEY
 
 
 public interface VisionGroup : Vision {
     public val children: VisionChildren
+
+    override fun update(change: VisionChange) {
+        change.children?.forEach { (name, change) ->
+            if (change.vision != null || change.vision == NullVision) {
+                error("VisionGroup is read-only")
+            } else {
+                children.getChild(name)?.update(change)
+            }
+        }
+        change.properties?.let {
+            updateProperties(it, Name.EMPTY)
+        }
+    }
 }
 
 public interface MutableVisionGroup : VisionGroup {
@@ -22,15 +36,6 @@ public interface MutableVisionGroup : VisionGroup {
     override val children: MutableVisionChildren
 
     public fun createGroup(): MutableVisionGroup
-}
-
-public val Vision.children: VisionChildren? get() = (this as? VisionGroup)?.children
-
-/**
- * A full base implementation for a [Vision]
- */
-@Serializable
-public abstract class AbstractVisionGroup : AbstractVision(), MutableVisionGroup {
 
     override fun update(change: VisionChange) {
         change.children?.forEach { (name, change) ->
@@ -44,6 +49,15 @@ public abstract class AbstractVisionGroup : AbstractVision(), MutableVisionGroup
             updateProperties(it, Name.EMPTY)
         }
     }
+}
+
+public val Vision.children: VisionChildren? get() = (this as? VisionGroup)?.children
+
+/**
+ * A full base implementation for a [Vision]
+ */
+@Serializable
+public abstract class AbstractVisionGroup : AbstractVision(), MutableVisionGroup {
 
     @SerialName("children")
     protected var childrenInternal: MutableMap<NameToken, Vision>? = null
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionProperties.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionProperties.kt
index 2fa88248..dfb06b50 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionProperties.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionProperties.kt
@@ -12,7 +12,7 @@ import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.get
 import space.kscience.dataforge.names.*
 
-public interface VisionProperties {
+public interface VisionProperties : MetaProvider {
 
     /**
      * Raw Visions own properties without styles, defaults, etc.
@@ -23,21 +23,26 @@ public interface VisionProperties {
 
     public fun getValue(
         name: Name,
-        inherit: Boolean? = null,
+        inherit: Boolean?,
         includeStyles: Boolean? = null,
     ): Value?
 
+    override fun getValue(name: Name): Value? = getValue(name, null, null)
+
     /**
      * Get property with given layer flags.
      * @param inherit toggles parent node property lookup. Null means inference from descriptor.
      * @param includeStyles toggles inclusion of properties from styles.
      */
-    public fun getProperty(
+    public fun getMeta(
         name: Name,
-        inherit: Boolean? = null,
+        inherit: Boolean?,
         includeStyles: Boolean? = null,
     ): Meta
 
+    override fun getMeta(name: Name): Meta? = getMeta(name, null, null)
+
+
     public val changes: Flow<Name>
 
     /**
@@ -47,9 +52,9 @@ public interface VisionProperties {
     public fun invalidate(propertyName: Name)
 }
 
-public interface MutableVisionProperties : VisionProperties {
+public interface MutableVisionProperties : VisionProperties, MutableMetaProvider {
 
-    override fun getProperty(
+    override fun getMeta(
         name: Name,
         inherit: Boolean?,
         includeStyles: Boolean?,
@@ -60,21 +65,31 @@ public interface MutableVisionProperties : VisionProperties {
         includeStyles,
     )
 
-    public fun setProperty(
+    public fun setMeta(
         name: Name,
         node: Meta?,
-        notify: Boolean = true,
+        notify: Boolean,
     )
 
     public fun setValue(
         name: Name,
         value: Value?,
-        notify: Boolean = true,
+        notify: Boolean,
     )
+
+    override fun getMeta(name: Name): MutableMeta = getMeta(name, null, null)
+
+    override fun setMeta(name: Name, node: Meta?) {
+        setMeta(name, node, true)
+    }
+
+    override fun setValue(name: Name, value: Value?) {
+        setValue(name, value, true)
+    }
 }
 
 public fun MutableVisionProperties.remove(name: Name) {
-    setProperty(name, null)
+    setMeta(name, null)
 }
 
 public fun MutableVisionProperties.remove(name: String) {
@@ -134,7 +149,7 @@ private class VisionPropertiesItem(
     )
 
     override fun setMeta(name: Name, node: Meta?) {
-        properties.setProperty(nodeName + name, node)
+        properties.setMeta(nodeName + name, node)
     }
 
     override fun toString(): String = Meta.toString(this)
@@ -187,7 +202,7 @@ public abstract class AbstractVisionProperties(
         return descriptor?.defaultValue
     }
 
-    override fun setProperty(name: Name, node: Meta?, notify: Boolean) {
+    override fun setMeta(name: Name, node: Meta?, notify: Boolean) {
         //ignore if the value is the same as existing
         if (own?.getMeta(name) == node) return
 
@@ -257,11 +272,11 @@ public fun VisionProperties.getValue(
 /**
  * Get [Vision] property using key as a String
  */
-public fun VisionProperties.getProperty(
+public fun VisionProperties.getMeta(
     name: String,
     inherit: Boolean? = null,
     includeStyles: Boolean? = null,
-): Meta = getProperty(name.parseAsName(), inherit, includeStyles)
+): Meta = getMeta(name.parseAsName(), inherit, includeStyles)
 
 /**
  * The root property node with given inheritance and style flags
@@ -271,33 +286,33 @@ public fun VisionProperties.getProperty(
 public fun MutableVisionProperties.root(
     inherit: Boolean? = null,
     includeStyles: Boolean? = null,
-): MutableMeta = getProperty(Name.EMPTY, inherit, includeStyles)
+): MutableMeta = getMeta(Name.EMPTY, inherit, includeStyles)
 
 
 /**
  * Get [Vision] property using key as a String
  */
-public fun MutableVisionProperties.getProperty(
+public fun MutableVisionProperties.getMeta(
     name: String,
     inherit: Boolean? = null,
     includeStyles: Boolean? = null,
-): MutableMeta = getProperty(name.parseAsName(), inherit, includeStyles)
+): MutableMeta = getMeta(name.parseAsName(), inherit, includeStyles)
 
-
-public operator fun MutableVisionProperties.set(name: Name, value: Number): Unit =
-    setValue(name, value.asValue())
-
-public operator fun MutableVisionProperties.set(name: String, value: Number): Unit =
-    set(name.parseAsName(), value)
-
-public operator fun MutableVisionProperties.set(name: Name, value: Boolean): Unit =
-    setValue(name, value.asValue())
-
-public operator fun MutableVisionProperties.set(name: String, value: Boolean): Unit =
-    set(name.parseAsName(), value)
-
-public operator fun MutableVisionProperties.set(name: Name, value: String): Unit =
-    setValue(name, value.asValue())
-
-public operator fun MutableVisionProperties.set(name: String, value: String): Unit =
-    set(name.parseAsName(), value)
\ No newline at end of file
+//
+//public operator fun MutableVisionProperties.set(name: Name, value: Number): Unit =
+//    setValue(name, value.asValue())
+//
+//public operator fun MutableVisionProperties.set(name: String, value: Number): Unit =
+//    set(name.parseAsName(), value)
+//
+//public operator fun MutableVisionProperties.set(name: Name, value: Boolean): Unit =
+//    setValue(name, value.asValue())
+//
+//public operator fun MutableVisionProperties.set(name: String, value: Boolean): Unit =
+//    set(name.parseAsName(), value)
+//
+//public operator fun MutableVisionProperties.set(name: Name, value: String): Unit =
+//    setValue(name, value.asValue())
+//
+//public operator fun MutableVisionProperties.set(name: String, value: String): Unit =
+//    set(name.parseAsName(), value)
\ No newline at end of file
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/flowProperty.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/flowProperty.kt
index c8f14ae3..f8d128e1 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/flowProperty.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/flowProperty.kt
@@ -17,10 +17,10 @@ public fun Vision.flowProperty(
     includeStyles: Boolean? = null,
 ): Flow<Meta> = flow {
     //Pass initial value.
-    emit(properties.getProperty(propertyName, inherit, includeStyles))
+    emit(properties.getMeta(propertyName, inherit, includeStyles))
     properties.changes.collect { name ->
         if (name.startsWith(propertyName)) {
-            emit(properties.getProperty(propertyName, inherit, includeStyles))
+            emit(properties.getMeta(propertyName, inherit, includeStyles))
         }
     }
 }
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/HtmlVisionRenderer.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/HtmlVisionRenderer.kt
index c02b6e64..d71e848a 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/HtmlVisionRenderer.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/HtmlVisionRenderer.kt
@@ -93,7 +93,6 @@ public fun FlowContent.visionFragment(
     updatesUrl: String? = null,
     onVisionRendered: (Name, Vision) -> Unit = { _, _ -> },
     idPrefix: String? = null,
-
     fragment: HtmlVisionFragment,
 ): Unit = consumer.visionFragment(
     visionManager = visionManager,
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/VisionOfHtmlInput.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/VisionOfHtmlInput.kt
index 3a818b08..d2bb2c52 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/VisionOfHtmlInput.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/html/VisionOfHtmlInput.kt
@@ -6,10 +6,11 @@ import space.kscience.dataforge.meta.boolean
 import space.kscience.dataforge.meta.number
 import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.Name
-import space.kscience.visionforge.*
+import space.kscience.visionforge.AbstractVision
+import space.kscience.visionforge.Vision
 
 //TODO replace by something
-internal val Vision.mutableProperties get() = properties.getProperty(Name.EMPTY, false, false)
+internal val Vision.mutableProperties get() = properties.getMeta(Name.EMPTY, false, false)
 
 @Serializable
 public abstract class VisionOfHtmlInput : AbstractVision() {
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/useProperty.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/useProperty.kt
index 87312f6f..f6f95a6f 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/useProperty.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/useProperty.kt
@@ -23,10 +23,10 @@ public fun Vision.useProperty(
     callback: (Meta) -> Unit,
 ): Job {
     //Pass initial value.
-    callback(properties.getProperty(propertyName, inherit, includeStyles))
+    callback(properties.getMeta(propertyName, inherit, includeStyles))
     return properties.changes.onEach { name ->
         if (name.startsWith(propertyName)) {
-            callback(properties.getProperty(propertyName, inherit, includeStyles))
+            callback(properties.getMeta(propertyName, inherit, includeStyles))
         }
     }.launchIn(scope ?: error("Orphan Vision can't observe properties"))
 }
diff --git a/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/html/HtmlTagTest.kt b/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/html/HtmlTagTest.kt
index eaea0a4e..20868b96 100644
--- a/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/html/HtmlTagTest.kt
+++ b/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/html/HtmlTagTest.kt
@@ -4,6 +4,7 @@ import kotlinx.html.*
 import kotlinx.html.stream.createHTML
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.visionforge.*
diff --git a/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt b/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt
index e9a0685e..a6ea86a2 100644
--- a/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt
+++ b/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt
@@ -42,7 +42,7 @@ internal class VisionPropertyTest {
     @Test
     fun testPropertyEdit() {
         val vision = manager.group()
-        vision.properties.getProperty("fff.ddd").apply {
+        vision.properties.getMeta("fff.ddd").apply {
             value = 2.asValue()
         }
         assertEquals(2, vision.properties.getValue("fff.ddd")?.int)
@@ -52,7 +52,7 @@ internal class VisionPropertyTest {
     @Test
     fun testPropertyUpdate() {
         val vision = manager.group()
-        vision.properties.getProperty("fff").updateWith(TestScheme) {
+        vision.properties.getMeta("fff").updateWith(TestScheme) {
             ddd = 2
         }
         assertEquals(2, vision.properties.getValue("fff.ddd")?.int)
@@ -87,7 +87,7 @@ internal class VisionPropertyTest {
 
         child.properties.remove("test")
 
-        assertEquals(11, child.properties.getProperty("test", inherit = true).int)
+        assertEquals(11, child.properties.getMeta("test", inherit = true).int)
 //        assertEquals(11, deferred.await()?.int)
 //        assertEquals(2, callCounter)
         subscription.cancel()
diff --git a/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/VisionClient.kt b/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/VisionClient.kt
index c9146efd..91e4f1bc 100644
--- a/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/VisionClient.kt
+++ b/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/VisionClient.kt
@@ -4,6 +4,7 @@ import kotlinx.browser.document
 import kotlinx.browser.window
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
@@ -11,10 +12,7 @@ import kotlinx.coroutines.sync.withLock
 import org.w3c.dom.*
 import org.w3c.dom.url.URL
 import space.kscience.dataforge.context.*
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.MetaSerializer
-import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.int
+import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.parseAsName
 import space.kscience.visionforge.html.VisionTagConsumer
@@ -68,7 +66,7 @@ public class VisionClient : AbstractPlugin() {
     /**
      * Communicate vision property changed from rendering engine to model
      */
-    public fun visionPropertyChanged(visionName: Name, propertyName: Name, item: Meta?) {
+    public fun notifyPropertyChanged(visionName: Name, propertyName: Name, item: Meta?) {
         context.launch {
             mutex.withLock {
                 changeCollector.propertyChanged(visionName, propertyName, item)
@@ -76,9 +74,17 @@ public class VisionClient : AbstractPlugin() {
         }
     }
 
-//    public fun visionChanged(name: Name?, child: Vision?) {
-//        changeCollector.setChild(name, child)
-//    }
+    private val eventCollector by lazy {
+        MutableSharedFlow<VisionEvent>(meta["feedback.eventCache"].int ?: 100)
+    }
+
+
+    /**
+     * Send a custom feedback event
+     */
+    public suspend fun sendEvent(event: VisionEvent) {
+        eventCollector.emit(event)
+    }
 
     private fun renderVision(element: Element, name: Name, vision: Vision, outputMeta: Meta) {
         vision.setAsRoot(visionManager)
@@ -103,7 +109,7 @@ public class VisionClient : AbstractPlugin() {
 
             logger.info { "Updating vision data from $wsUrl" }
 
-            //Individual websocket for this element
+            //Individual websocket for this vision
             WebSocket(wsUrl.toString()).apply {
                 onmessage = { messageEvent ->
                     val stringData: String? = messageEvent.data as? String
@@ -131,7 +137,7 @@ public class VisionClient : AbstractPlugin() {
                 var feedbackJob: Job? = null
 
                 //Feedback changes aggregation time in milliseconds
-                val feedbackAggregationTime = meta["aggregationTime"]?.int ?: 300
+                val feedbackAggregationTime = meta["feedback.aggregationTime"]?.int ?: 300
 
                 onopen = {
                     feedbackJob = visionManager.context.launch {
@@ -144,18 +150,24 @@ public class VisionClient : AbstractPlugin() {
                                     change.reset()
                                 }
                             }
+//                            // take channel for given vision name
+//                            eventCollector[name]?.let { channel ->
+//                                for (e in channel) {
+//                                    send(visionManager.jsonFormat.encodeToString(VisionEvent.serializer(), e))
+//                                }
+//                            }
                         }
                     }
-                    logger.info { "WebSocket update channel established for output '$name'" }
+                    logger.info { "WebSocket feedback channel established for output '$name'" }
                 }
 
                 onclose = {
                     feedbackJob?.cancel()
-                    logger.info { "WebSocket update channel closed for output '$name'" }
+                    logger.info { "WebSocket feedback channel closed for output '$name'" }
                 }
                 onerror = {
                     feedbackJob?.cancel()
-                    logger.error { "WebSocket update channel error for output '$name'" }
+                    logger.error { "WebSocket feedback channel error for output '$name'" }
                 }
             }
         }
@@ -248,20 +260,26 @@ public class VisionClient : AbstractPlugin() {
     }
 }
 
-public fun VisionClient.visionPropertyChanged(visionName: Name, propertyName: String, item: Meta?) {
-    visionPropertyChanged(visionName, propertyName.parseAsName(true), item)
+public fun VisionClient.notifyPropertyChanged(visionName: Name, propertyName: String, item: Meta?) {
+    notifyPropertyChanged(visionName, propertyName.parseAsName(true), item)
 }
 
-public fun VisionClient.visionPropertyChanged(visionName: Name, propertyName: String, item: Number) {
-    visionPropertyChanged(visionName, propertyName.parseAsName(true), Meta(item))
+public fun VisionClient.notifyPropertyChanged(visionName: Name, propertyName: String, item: Number) {
+    notifyPropertyChanged(visionName, propertyName.parseAsName(true), Meta(item))
 }
 
-public fun VisionClient.visionPropertyChanged(visionName: Name, propertyName: String, item: String) {
-    visionPropertyChanged(visionName, propertyName.parseAsName(true), Meta(item))
+public fun VisionClient.notifyPropertyChanged(visionName: Name, propertyName: String, item: String) {
+    notifyPropertyChanged(visionName, propertyName.parseAsName(true), Meta(item))
 }
 
-public fun VisionClient.visionPropertyChanged(visionName: Name, propertyName: String, item: Boolean) {
-    visionPropertyChanged(visionName, propertyName.parseAsName(true), Meta(item))
+public fun VisionClient.notifyPropertyChanged(visionName: Name, propertyName: String, item: Boolean) {
+    notifyPropertyChanged(visionName, propertyName.parseAsName(true), Meta(item))
+}
+
+public fun VisionClient.sendEvent(visionName: Name, event: MetaRepr): Unit {
+    context.launch {
+        sendEvent(VisionMetaEvent(visionName, event.toMeta()))
+    }
 }
 
 private fun whenDocumentLoaded(block: Document.() -> Unit): Unit {
diff --git a/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/inputRenderers.kt b/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/inputRenderers.kt
index 390058ea..faf82d13 100644
--- a/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/inputRenderers.kt
+++ b/visionforge-core/src/jsMain/kotlin/space/kscience/visionforge/inputRenderers.kt
@@ -36,7 +36,7 @@ internal fun textVisionRenderer(
             value = it ?: ""
         }
         onChangeFunction = {
-            client.visionPropertyChanged(name, VisionOfTextField::text.name, value)
+            client.notifyPropertyChanged(name, VisionOfTextField::text.name, value)
         }
     }
 }
@@ -58,7 +58,7 @@ internal fun numberVisionRenderer(
             value = it?.toDouble() ?: 0.0
         }
         onChangeFunction = {
-            client.visionPropertyChanged(name, VisionOfNumberField::value.name, value)
+            client.notifyPropertyChanged(name, VisionOfNumberField::value.name, value)
         }
     }
 }
@@ -106,7 +106,7 @@ internal fun formVisionRenderer(
     form.onsubmit = { event ->
         event.preventDefault()
         val formData = FormData(form).toMeta()
-        client.visionPropertyChanged(name, VisionOfHtmlForm::values.name, formData)
+        client.notifyPropertyChanged(name, VisionOfHtmlForm::values.name, formData)
         console.info("Sent: ${formData.toMap()}")
         false
     }
diff --git a/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt b/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt
index f92e7d4d..d5333dda 100644
--- a/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt
+++ b/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt
@@ -10,7 +10,6 @@ import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.plotly.Plot
 import space.kscience.plotly.Plotly
@@ -34,7 +33,7 @@ public class VisionOfPlotly private constructor(
 
     @Transient
     override val properties: MutableVisionProperties = object : MutableVisionProperties {
-        override fun setProperty(name: Name, node: Meta?, notify: Boolean) {
+        override fun setMeta(name: Name, node: Meta?, notify: Boolean) {
             meta.setMeta(name, node)
         }
 
@@ -46,7 +45,7 @@ public class VisionOfPlotly private constructor(
 
         override val descriptor: MetaDescriptor? get() = this@VisionOfPlotly.descriptor
 
-        override fun getProperty(
+        override fun getMeta(
             name: Name,
             inherit: Boolean?,
             includeStyles: Boolean?,
diff --git a/visionforge-server/src/main/kotlin/space/kscience/visionforge/server/VisionServer.kt b/visionforge-server/src/main/kotlin/space/kscience/visionforge/server/VisionServer.kt
index 61952497..873a52c9 100644
--- a/visionforge-server/src/main/kotlin/space/kscience/visionforge/server/VisionServer.kt
+++ b/visionforge-server/src/main/kotlin/space/kscience/visionforge/server/VisionServer.kt
@@ -23,10 +23,7 @@ import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.ContextAware
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.Name
-import space.kscience.visionforge.Vision
-import space.kscience.visionforge.VisionChange
-import space.kscience.visionforge.VisionManager
-import space.kscience.visionforge.flowChanges
+import space.kscience.visionforge.*
 import space.kscience.visionforge.html.*
 import kotlin.time.Duration.Companion.milliseconds
 
@@ -77,6 +74,11 @@ public class VisionRoute(
  */
 public fun Application.serveVisionData(
     configuration: VisionRoute,
+    onEvent: suspend Vision.(VisionEvent) -> Unit = { event ->
+        if (event is VisionChange) {
+            update(event)
+        }
+    },
     resolveVision: (Name) -> Vision?,
 ) {
     require(WebSockets)
@@ -96,11 +98,11 @@ public fun Application.serveVisionData(
                 launch {
                     for (frame in incoming) {
                         val data = frame.data.decodeToString()
-                        application.log.debug("Received update for $name: \n$data")
-                        val change = configuration.visionManager.jsonFormat.decodeFromString(
-                            VisionChange.serializer(), data
+                        application.log.debug("Received event for $name: \n$data")
+                        val event = configuration.visionManager.jsonFormat.decodeFromString(
+                            VisionEvent.serializer(), data
                         )
-                        vision.update(change)
+                        vision.onEvent(event)
                     }
                 }
 
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Composite.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Composite.kt
index 7c6ab3ec..65a1bcd5 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Composite.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Composite.kt
@@ -3,7 +3,10 @@ package space.kscience.visionforge.solid
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import space.kscience.dataforge.names.Name
-import space.kscience.visionforge.*
+import space.kscience.visionforge.MutableVisionContainer
+import space.kscience.visionforge.VisionBuilder
+import space.kscience.visionforge.setChild
+import space.kscience.visionforge.static
 
 public enum class CompositeType {
     GROUP, // Dumb sum of meshes
@@ -33,7 +36,7 @@ public inline fun MutableVisionContainer<Solid>.composite(
     }
     val res = Composite(type, children[0], children[1])
 
-    res.properties.setProperty(Name.EMPTY, group.properties.own)
+    res.properties.setMeta(Name.EMPTY, group.properties.own)
 
     setChild(name, res)
     return res
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt
index 46430b30..8276722e 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt
@@ -9,37 +9,8 @@ import space.kscience.kmath.geometry.component2
 import space.kscience.visionforge.MutableVisionContainer
 import space.kscience.visionforge.VisionBuilder
 import space.kscience.visionforge.setChild
-import kotlin.math.PI
-import kotlin.math.cos
-import kotlin.math.sin
 
 
-public typealias Shape2D = List<Float32Vector2D>
-
-@Serializable
-public class Shape2DBuilder(private val points: ArrayList<Float32Vector2D> = ArrayList()) {
-
-    public fun point(x: Number, y: Number) {
-        points.add(Float32Vector2D(x, y))
-    }
-
-    public fun build(): Shape2D = points
-}
-
-public fun Shape2DBuilder.polygon(vertices: Int, radius: Number) {
-    require(vertices > 2) { "Polygon must have more than 2 vertices" }
-    val angle = 2 * PI / vertices
-    for (i in 0 until vertices) {
-        point(radius.toDouble() * cos(angle * i), radius.toDouble() * sin(angle * i))
-    }
-}
-
-/**
- * A layer for extruded shape
- */
-@Serializable
-public data class Layer(var x: Float, var y: Float, var z: Float, var scale: Float)
-
 /**
  * An extruded shape with the same number of points on each layer.
  */
@@ -50,6 +21,12 @@ public class Extruded(
     public val layers: List<Layer>,
 ) : SolidBase<Extruded>(), GeometrySolid {
 
+    /**
+     * A layer for extruded shape
+     */
+    @Serializable
+    public data class Layer(var x: Float, var y: Float, var z: Float, var scale: Float)
+
     init {
         require(shape.size > 2) { "Extruded shape requires more than 2 points per layer" }
     }
@@ -72,6 +49,8 @@ public class Extruded(
         var lowerLayer = layers.first()
         var upperLayer: List<Float32Vector3D>
 
+        geometryBuilder.cap(layers.first().reversed())
+
         for (i in (1 until layers.size)) {
             upperLayer = layers[i]
             for (j in (0 until shape.size - 1)) {
@@ -93,7 +72,7 @@ public class Extruded(
             )
             lowerLayer = upperLayer
         }
-        geometryBuilder.cap(layers.first().reversed())
+
         geometryBuilder.cap(layers.last())
     }
 
@@ -102,16 +81,18 @@ public class Extruded(
         public var layers: MutableList<Layer> = ArrayList(),
         public val properties: MutableMeta = MutableMeta(),
     ) {
+        @VisionBuilder
         public fun shape(block: Shape2DBuilder.() -> Unit) {
             this.shape = Shape2DBuilder().apply(block).build()
         }
 
+        @VisionBuilder
         public fun layer(z: Number, x: Number = 0.0, y: Number = 0.0, scale: Number = 1.0) {
             layers.add(Layer(x.toFloat(), y.toFloat(), z.toFloat(), scale.toFloat()))
         }
 
         internal fun build(): Extruded = Extruded(shape, layers).apply {
-            this.properties.setProperty(Name.EMPTY, this@Builder.properties)
+            this.properties.setMeta(Name.EMPTY, this@Builder.properties)
         }
     }
 
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/PolyLine.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/PolyLine.kt
index 1681f44a..0ead1642 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/PolyLine.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/PolyLine.kt
@@ -13,7 +13,10 @@ import space.kscience.visionforge.setChild
 public class PolyLine(public val points: List<Float32Vector3D>) : SolidBase<PolyLine>() {
 
     //var lineType by string()
-    public var thickness: Number by properties.root(inherit = false, includeStyles = true).number { DEFAULT_THICKNESS }
+    public var thickness: Number by properties.root(
+        inherit = false,
+        includeStyles = true
+    ).number { DEFAULT_THICKNESS }
 
     public companion object {
         public const val DEFAULT_THICKNESS: Double = 1.0
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Shape2D.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Shape2D.kt
new file mode 100644
index 00000000..4f5d48a4
--- /dev/null
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Shape2D.kt
@@ -0,0 +1,26 @@
+package space.kscience.visionforge.solid
+
+import kotlinx.serialization.Serializable
+import kotlin.math.PI
+import kotlin.math.cos
+import kotlin.math.sin
+
+public typealias Shape2D = List<Float32Vector2D>
+
+@Serializable
+public class Shape2DBuilder(private val points: ArrayList<Float32Vector2D> = ArrayList()) {
+
+    public fun point(x: Number, y: Number) {
+        points.add(Float32Vector2D(x, y))
+    }
+
+    public fun build(): Shape2D = points
+}
+
+public fun Shape2DBuilder.polygon(vertices: Int, radius: Number) {
+    require(vertices > 2) { "Polygon must have more than 2 vertices" }
+    val angle = 2 * PI / vertices
+    for (i in 0 until vertices) {
+        point(radius.toDouble() * cos(angle * i), radius.toDouble() * sin(angle * i))
+    }
+}
\ No newline at end of file
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solid.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solid.kt
index f33573d7..3972de83 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solid.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solid.kt
@@ -11,8 +11,10 @@ import space.kscience.dataforge.names.plus
 import space.kscience.kmath.complex.Quaternion
 import space.kscience.kmath.complex.QuaternionField
 import space.kscience.kmath.geometry.*
-import space.kscience.visionforge.*
+import space.kscience.visionforge.Vision
 import space.kscience.visionforge.Vision.Companion.VISIBLE_KEY
+import space.kscience.visionforge.hide
+import space.kscience.visionforge.inherited
 import space.kscience.visionforge.solid.Solid.Companion.DETAIL_KEY
 import space.kscience.visionforge.solid.Solid.Companion.IGNORE_KEY
 import space.kscience.visionforge.solid.Solid.Companion.LAYER_KEY
@@ -182,7 +184,7 @@ internal fun point(
 
         override fun setValue(thisRef: Solid, property: KProperty<*>, value: Float32Vector3D?) {
             if (value == null) {
-                thisRef.properties.setProperty(name, null)
+                thisRef.properties.setMeta(name, null)
             } else {
                 thisRef.properties[name + X_KEY] = value.x
                 thisRef.properties[name + Y_KEY] = value.y
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidMaterial.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidMaterial.kt
index df720e6c..14784065 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidMaterial.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidMaterial.kt
@@ -107,12 +107,12 @@ public val Solid.color: ColorAccessor
     get() = ColorAccessor(properties.root(true), MATERIAL_COLOR_KEY)
 
 public var Solid.material: SolidMaterial?
-    get() = SolidMaterial.read(properties.getProperty(MATERIAL_KEY))
-    set(value) = properties.setProperty(MATERIAL_KEY, value?.meta)
+    get() = SolidMaterial.read(properties.getMeta(MATERIAL_KEY))
+    set(value) = properties.setMeta(MATERIAL_KEY, value?.meta)
 
 @VisionBuilder
 public fun Solid.material(builder: SolidMaterial.() -> Unit) {
-    properties.getProperty(MATERIAL_KEY).updateWith(SolidMaterial, builder)
+    properties.getMeta(MATERIAL_KEY).updateWith(SolidMaterial, builder)
 }
 
 public var Solid.opacity: Number?
@@ -125,5 +125,5 @@ public var Solid.opacity: Number?
 @VisionBuilder
 public fun Solid.edges(enabled: Boolean = true, block: SolidMaterial.() -> Unit = {}) {
     properties[SolidMaterial.EDGES_ENABLED_KEY] = enabled
-    SolidMaterial.write(properties.getProperty(SolidMaterial.EDGES_MATERIAL_KEY)).apply(block)
+    SolidMaterial.write(properties.getMeta(SolidMaterial.EDGES_MATERIAL_KEY)).apply(block)
 }
\ No newline at end of file
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt
index 2770a7aa..a6aabe67 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/SolidReference.kt
@@ -14,7 +14,6 @@ import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.get
 import space.kscience.dataforge.names.*
 import space.kscience.visionforge.*
-import space.kscience.visionforge.AbstractVisionGroup.Companion.updateProperties
 import space.kscience.visionforge.solid.SolidReference.Companion.REFERENCE_CHILD_PROPERTY_PREFIX
 
 
@@ -162,7 +161,7 @@ internal class SolidReferenceChild(
     override val properties: MutableVisionProperties = object : MutableVisionProperties {
         override val descriptor: MetaDescriptor get() = this@SolidReferenceChild.descriptor
 
-        override val own: MutableMeta by lazy { owner.properties.getProperty(childToken(childName).asName()) }
+        override val own: MutableMeta by lazy { owner.properties.getMeta(childToken(childName).asName()) }
 
         override fun getValue(
             name: Name,
@@ -170,7 +169,7 @@ internal class SolidReferenceChild(
             includeStyles: Boolean?,
         ): Value? = own.getValue(name) ?: prototype.properties.getValue(name, inherit, includeStyles)
 
-        override fun setProperty(name: Name, node: Meta?, notify: Boolean) {
+        override fun setMeta(name: Name, node: Meta?, notify: Boolean) {
             own.setMeta(name, node)
         }
 
@@ -185,20 +184,6 @@ internal class SolidReferenceChild(
         }
     }
 
-    override fun update(change: VisionChange) {
-        change.children?.forEach { (name, change) ->
-            when {
-                change.vision == NullVision -> error("Deleting children inside ref is not allowed.")
-                change.vision != null -> error("Updating content of the ref is not allowed")
-                else -> children.getChild(name)?.update(change)
-            }
-        }
-        change.properties?.let {
-            updateProperties(it, Name.EMPTY)
-        }
-    }
-
-
     override val children: VisionChildren = object : VisionChildren {
         override val parent: Vision get() = this@SolidReferenceChild
 
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt
index 1477c2a0..2a2e86fc 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt
@@ -41,6 +41,7 @@ public class Solids(meta: Meta) : VisionPlugin(meta), MutableVisionContainer<Sol
             subclass(ConeSurface.serializer())
             subclass(Convex.serializer())
             subclass(Extruded.serializer())
+            subclass(Surface.serializer())
             subclass(PolyLine.serializer())
             subclass(SolidLabel.serializer())
             subclass(Sphere.serializer())
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/LayersSurface.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Surface.kt
similarity index 77%
rename from visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/LayersSurface.kt
rename to visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Surface.kt
index 4a637762..35f9b75f 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/LayersSurface.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Surface.kt
@@ -2,9 +2,14 @@ package space.kscience.visionforge.solid
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
+import space.kscience.dataforge.meta.MutableMeta
+import space.kscience.dataforge.names.Name
 import space.kscience.kmath.geometry.component1
 import space.kscience.kmath.geometry.component2
 import space.kscience.kmath.structures.Float32
+import space.kscience.visionforge.MutableVisionContainer
+import space.kscience.visionforge.VisionBuilder
+import space.kscience.visionforge.setChild
 
 
 private inline fun <T> Iterable<T>.sumOf(selector: (T) -> Float32): Float32 {
@@ -20,9 +25,9 @@ private inline fun <T> Iterable<T>.sumOf(selector: (T) -> Float32): Float32 {
  */
 @Serializable
 @SerialName("solid.surface")
-public class LayersSurface(
+public class Surface(
     public val layers: List<Layer>,
-) : SolidBase<Extruded>(), GeometrySolid {
+) : SolidBase<Surface>(), GeometrySolid {
 
     @Serializable
     public data class Layer(val z: Float32, val outer: Shape2D, val inner: Shape2D?) {
@@ -58,7 +63,7 @@ public class LayersSurface(
             //outer and inner
             for (i in 0 until layers.size - 1) {
                 val bottom = layers[i]
-                val top = layers[i+1]
+                val top = layers[i + 1]
 
                 //creating shape in x-y plane with z = 0
                 val bottomOuterPoints = bottom.outerPoints()
@@ -130,7 +135,39 @@ public class LayersSurface(
         }
     }
 
+    public class Builder(
+        public var layers: MutableList<Layer> = ArrayList(),
+        public val properties: MutableMeta = MutableMeta(),
+    ) {
+
+        public fun layer(
+            z: Number,
+            innerBuilder: (Shape2DBuilder.() -> Unit)? = null,
+            outerBuilder: Shape2DBuilder.() -> Unit,
+        ) {
+            layers.add(
+                Layer(
+                    z.toFloat(),
+                    outer = Shape2DBuilder().apply(outerBuilder).build(),
+                    inner = innerBuilder?.let { Shape2DBuilder().apply(innerBuilder).build() }
+                )
+            )
+        }
+
+        internal fun build(): Surface = Surface(layers).apply {
+            properties.setMeta(Name.EMPTY, this@Builder.properties)
+        }
+    }
+
+
     public companion object {
         public const val TYPE: String = "solid.surface"
     }
 }
+
+
+@VisionBuilder
+public fun MutableVisionContainer<Solid>.surface(
+    name: String? = null,
+    action: Surface.Builder.() -> Unit = {},
+): Surface = Surface.Builder().apply(action).build().also { setChild(name, it) }
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/transform/RemoveSingleChild.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/transform/RemoveSingleChild.kt
index d2667e76..cdc9caaf 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/transform/RemoveSingleChild.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/transform/RemoveSingleChild.kt
@@ -19,7 +19,7 @@ internal fun Solid.updateFrom(other: Solid): Solid {
     scaleX *= other.scaleX
     scaleY *= other.scaleY
     scaleZ *= other.scaleZ
-    properties.setProperty(Name.EMPTY, other.properties.root())
+    properties.setMeta(Name.EMPTY, other.properties.root())
     return this
 }
 
diff --git a/visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/SolidPropertyTest.kt b/visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/SolidPropertyTest.kt
index 87ba368c..e4b0619d 100644
--- a/visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/SolidPropertyTest.kt
+++ b/visionforge-solid/src/commonTest/kotlin/space/kscience/visionforge/solid/SolidPropertyTest.kt
@@ -5,6 +5,7 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.test.runTest
 import space.kscience.dataforge.meta.int
+import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.names.asName
 import space.kscience.visionforge.*
diff --git a/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt b/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt
index 45325430..42722254 100644
--- a/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt
+++ b/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt
@@ -24,7 +24,7 @@ public object ThreeLineFactory : ThreeFactory<PolyLine> {
         }
 
         val material = ThreeMaterials.getLineMaterial(
-            vision.properties.getProperty(SolidMaterial.MATERIAL_KEY),
+            vision.properties.getMeta(SolidMaterial.MATERIAL_KEY),
             false
         )
 
diff --git a/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMaterials.kt b/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMaterials.kt
index f5ac5c2b..49667c8e 100644
--- a/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMaterials.kt
+++ b/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMaterials.kt
@@ -83,7 +83,7 @@ public object ThreeMaterials {
     private val visionMaterialCache = HashMap<Vision, Material>()
 
     internal fun cacheMaterial(vision: Vision): Material = visionMaterialCache.getOrPut(vision) {
-        buildMaterial(vision.properties.getProperty(SolidMaterial.MATERIAL_KEY)).apply {
+        buildMaterial(vision.properties.getMeta(SolidMaterial.MATERIAL_KEY)).apply {
             cached = true
         }
     }
@@ -133,11 +133,11 @@ public fun Mesh.setMaterial(vision: Vision) {
         } else {
             material = vision.parent?.let { parent ->
                 //TODO cache parent material
-                ThreeMaterials.buildMaterial(parent.properties.getProperty(SolidMaterial.MATERIAL_KEY))
+                ThreeMaterials.buildMaterial(parent.properties.getMeta(SolidMaterial.MATERIAL_KEY))
             } ?: ThreeMaterials.cacheMaterial(vision)
         }
     } else {
-        material = ThreeMaterials.buildMaterial(vision.properties.getProperty(SolidMaterial.MATERIAL_KEY))
+        material = ThreeMaterials.buildMaterial(vision.properties.getMeta(SolidMaterial.MATERIAL_KEY))
     }
 }
 
@@ -153,18 +153,18 @@ public fun Mesh.updateMaterialProperty(vision: Vision, propertyName: Name) {
         when (propertyName) {
             SolidMaterial.MATERIAL_COLOR_KEY -> {
                 material.asDynamic().color =
-                    vision.properties.getProperty(SolidMaterial.MATERIAL_COLOR_KEY).threeColor()
+                    vision.properties.getMeta(SolidMaterial.MATERIAL_COLOR_KEY).threeColor()
                         ?: ThreeMaterials.DEFAULT_COLOR
             }
 
             SolidMaterial.SPECULAR_COLOR_KEY -> {
                 material.asDynamic().specular =
-                    vision.properties.getProperty(SolidMaterial.SPECULAR_COLOR_KEY).threeColor()
+                    vision.properties.getMeta(SolidMaterial.SPECULAR_COLOR_KEY).threeColor()
                         ?: ThreeMaterials.DEFAULT_COLOR
             }
 
             SolidMaterial.MATERIAL_EMISSIVE_COLOR_KEY -> {
-                material.asDynamic().emissive = vision.properties.getProperty(SolidMaterial.MATERIAL_EMISSIVE_COLOR_KEY)
+                material.asDynamic().emissive = vision.properties.getMeta(SolidMaterial.MATERIAL_EMISSIVE_COLOR_KEY)
                     .threeColor()
                     ?: ThreeMaterials.BLACK_COLOR
             }
diff --git a/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt b/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt
index 06224bbb..4ba19998 100644
--- a/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt
+++ b/visionforge-threejs/src/jsMain/kotlin/space/kscience/visionforge/solid/three/ThreeMeshFactory.kt
@@ -76,7 +76,7 @@ public fun Mesh.applyEdges(vision: Solid) {
     val edges = children.find { it.name == EDGES_OBJECT_NAME } as? LineSegments
     //inherited edges definition, enabled by default
     if (vision.properties.getValue(EDGES_ENABLED_KEY, inherit = false)?.boolean != false) {
-        val material = ThreeMaterials.getLineMaterial(vision.properties.getProperty(EDGES_MATERIAL_KEY), true)
+        val material = ThreeMaterials.getLineMaterial(vision.properties.getMeta(EDGES_MATERIAL_KEY), true)
         if (edges == null) {
             add(
                 LineSegments(