diff --git a/src/main/java/org/holoeasy/builder/HologramBuilder.java b/src/main/java/org/holoeasy/builder/HologramBuilder.java
index 68b5caf..29facae 100644
--- a/src/main/java/org/holoeasy/builder/HologramBuilder.java
+++ b/src/main/java/org/holoeasy/builder/HologramBuilder.java
@@ -10,6 +10,7 @@
 import org.holoeasy.line.ILine;
 import org.holoeasy.line.ITextLine;
 import org.holoeasy.pool.IHologramPool;
+import org.holoeasy.reactive.MutableState;
 import org.jetbrains.annotations.NotNull;
 
 public class HologramBuilder {
@@ -78,8 +79,15 @@ public static void item(@NotNull ItemStack block) {
         getInstance().itemline(block);
     }
 
+    public static void item(@NotNull MutableState<ItemStack> block) {
+        getInstance().itemline(block);
+    }
+
     public static void customline(@NotNull ILine<?> customLine) {
         getInstance().customLine(customLine);
     }
 
+    public static <T> MutableState<T> mutableStateOf(T initialValue) {
+        return new MutableState<>(initialValue);
+    }
 }
\ No newline at end of file
diff --git a/src/main/java/org/holoeasy/builder/Service.kt b/src/main/java/org/holoeasy/builder/Service.kt
index 8316222..e6a67d5 100644
--- a/src/main/java/org/holoeasy/builder/Service.kt
+++ b/src/main/java/org/holoeasy/builder/Service.kt
@@ -6,6 +6,7 @@ import org.holoeasy.builder.interfaces.HologramConfigGroup
 import org.holoeasy.builder.interfaces.PlayerFun
 import org.holoeasy.hologram.TextBlockStandardLoader
 import org.holoeasy.line.*
+import org.holoeasy.reactive.MutableState
 
 object Service {
 
@@ -51,6 +52,12 @@ object Service {
         holo.lines.add(blockline)
     }
 
+    fun itemline(block: MutableState<ItemStack>) {
+        val holo = getStaticHolo()
+        val blockline = BlockLine(holo.key.plugin, block)
+        holo.lines.add(blockline)
+    }
+
     fun customLine(customLine: ILine<*>) {
         val holo = getStaticHolo()
         holo.lines.add(customLine)
diff --git a/src/main/java/org/holoeasy/hologram/Hologram.kt b/src/main/java/org/holoeasy/hologram/Hologram.kt
index d924232..f6580a1 100644
--- a/src/main/java/org/holoeasy/hologram/Hologram.kt
+++ b/src/main/java/org/holoeasy/hologram/Hologram.kt
@@ -35,6 +35,7 @@ class Hologram(val key: HologramKey, location: Location, val loader: IHologramLo
 
     fun load(vararg lines: ILine<*>) {
         hLines.clear()
+        lines.forEach { it.pvt.hologram = this }
         loader.load(this, lines)
     }
 
diff --git a/src/main/java/org/holoeasy/line/BlockLine.kt b/src/main/java/org/holoeasy/line/BlockLine.kt
index f64ac52..d98bc9d 100644
--- a/src/main/java/org/holoeasy/line/BlockLine.kt
+++ b/src/main/java/org/holoeasy/line/BlockLine.kt
@@ -10,13 +10,16 @@ import org.holoeasy.ext.send
 import org.holoeasy.packet.IPacket
 import org.holoeasy.reactive.MutableState
 
-class BlockLine(plugin: Plugin, obj: ItemStack) : ILine<ItemStack> {
+class BlockLine(plugin: Plugin, obj: MutableState<ItemStack>) : ILine<ItemStack> {
 
 
     private val line: Line = Line(plugin, EntityType.DROPPED_ITEM)
     private val resetVelocity = IPacket.get(IPacket.Type.VELOCITY).velocity(line.entityID, 0, 0,0)
 
-    private val _mutableStateOf = MutableState(obj)
+    private val _mutableStateOf = obj.also { it.addObserver(pvt) }
+
+    constructor(plugin: Plugin, obj: ItemStack) : this(plugin, MutableState(obj)){
+    }
 
     override val plugin: Plugin
         get() = line.plugin
diff --git a/src/main/java/org/holoeasy/line/ILine.kt b/src/main/java/org/holoeasy/line/ILine.kt
index 2ad7d08..d03d303 100644
--- a/src/main/java/org/holoeasy/line/ILine.kt
+++ b/src/main/java/org/holoeasy/line/ILine.kt
@@ -11,9 +11,9 @@ interface ILine<T> {
 
     data class PrivateConfig(private val line: ILine<*>) : Observer {
 
-        var hologram : Hologram? = null
+        lateinit var hologram: Hologram
         override fun observerUpdate() {
-            hologram?.let {
+            hologram.let {
                 line.update(it.seeingPlayers)
             }
         }
diff --git a/src/test/java/ExampleKotlin.kt b/src/test/java/ExampleKotlin.kt
new file mode 100644
index 0000000..c1f83da
--- /dev/null
+++ b/src/test/java/ExampleKotlin.kt
@@ -0,0 +1,28 @@
+import org.bukkit.Location
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+import org.bukkit.plugin.Plugin
+import org.holoeasy.HoloEasy.startInteractivePool
+import org.holoeasy.builder.HologramBuilder.*
+import org.holoeasy.config.HologramKey
+
+
+data class ExampleKotlin(val plugin: Plugin) {
+
+    // you can use a Pool or a org.bukkit.Plugin for HologramKey
+    val pool = startInteractivePool(plugin, 60.0, 0.5f, 5f)
+
+
+    fun addHologram(location: Location) {
+        val itemState = mutableStateOf(ItemStack(Material.APPLE))
+
+        hologram(HologramKey(pool, "unique-id-holo"), location) {
+            clickable("Click me").onClick {
+                itemState.set(ItemStack(Material.ENCHANTED_GOLDEN_APPLE))
+            }
+            item(itemState)
+        }
+
+    }
+
+}
\ No newline at end of file