diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/util/PistonCalculator.java b/BauSystem_Main/src/de/steamwar/bausystem/features/util/PistonCalculator.java
index 281b159f..b72c7aeb 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/util/PistonCalculator.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/util/PistonCalculator.java
@@ -20,11 +20,15 @@
 package de.steamwar.bausystem.features.util;
 
 import de.steamwar.bausystem.BauSystem;
+import de.steamwar.entity.REntityServer;
+import de.steamwar.entity.RFallingBlockEntity;
 import de.steamwar.linkage.Linked;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.ToString;
 import net.md_5.bungee.api.ChatMessageType;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
@@ -37,10 +41,7 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.block.Action;
 import org.bukkit.event.player.PlayerInteractEvent;
 
-import java.util.HashSet;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Set;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 @Linked
@@ -59,6 +60,7 @@ public class PistonCalculator implements Listener {
         boolean pulling = blockType == Material.STICKY_PISTON && (clickedBlock.getRelative(piston.getFacing()).getType() == Material.AIR || piston.isExtended());
 
         CalculationResult result = calc(clickedBlock, piston.getFacing(), (pulling ? piston.getFacing().getOppositeFace() : piston.getFacing()));
+        result.entityServer.addPlayer(event.getPlayer());
         BauSystem.MESSAGE.sendPrefixless("PISTON_INFO", event.getPlayer(), ChatMessageType.ACTION_BAR, result.unmovable ? "§c" : (result.tooMany ? "§e" : "§a"), result.amount);
     }
 
@@ -66,7 +68,7 @@ public class PistonCalculator implements Listener {
 
     private CalculationResult calc(Block origin, BlockFace facing, BlockFace direction) {
         Set<Block> blockSet = new HashSet<>();
-        AtomicBoolean unmovable = new AtomicBoolean();
+        Set<Location> unmovable = new HashSet<>();
 
         Block calcOrigin = origin;
         if (facing != direction) calcOrigin = origin.getRelative(facing, 3);
@@ -95,21 +97,30 @@ public class PistonCalculator implements Listener {
 
         blockSet.remove(origin);
         if (facing != direction) blockSet.remove(origin.getRelative(facing, 1));
-        return new CalculationResult(blockSet.size(), blockSet.size() > 12, unmovable.get());
+
+        REntityServer entityServer = new REntityServer();
+        for (Location loc : unmovable) {
+            RFallingBlockEntity rFallingBlockEntity = new RFallingBlockEntity(entityServer, loc.clone().add(0.5, 0, 0.5), Material.RED_STAINED_GLASS);
+            rFallingBlockEntity.setGlowing(true);
+            rFallingBlockEntity.setNoGravity(true);
+            rFallingBlockEntity.setInvisible(true);
+        }
+        Bukkit.getScheduler().runTaskLater(BauSystem.getInstance(), entityServer::close, 20);
+        return new CalculationResult(blockSet.size(), blockSet.size() > 12, !unmovable.isEmpty(), entityServer);
     }
 
-    private void calcDirection(Block origin, Block blockOrigin, Block calcOrigin, Block ignore, BlockFace facing, BlockFace direction, Set<Block> blockSet, List<Block> toCalc, AtomicBoolean unmovable) {
+    private void calcDirection(Block origin, Block blockOrigin, Block calcOrigin, Block ignore, BlockFace facing, BlockFace direction, Set<Block> blockSet, List<Block> toCalc, Set<Location> unmovable) {
         for (int i = 1; i < 13; i++) {
             Block block = calcOrigin.getRelative(direction, i);
             if (block.equals(ignore)) return;
             if (block.getPistonMoveReaction() == PistonMoveReaction.BREAK) return;
             if (!isPiston(block) && (block.getPistonMoveReaction() == PistonMoveReaction.BLOCK || block.getPistonMoveReaction() == PistonMoveReaction.IGNORE || block.getState() instanceof TileState)) {
-                unmovable.set(true);
+                unmovable.add(block.getLocation());
                 return;
             }
             if (block.getType().isAir()) return;
             if (facing == direction && block.equals(blockOrigin)) {
-                unmovable.set(true);
+                unmovable.add(block.getLocation());
                 return;
             }
             if (facing != direction && (block.equals(origin) || block.getRelative(facing.getOppositeFace()).equals(origin))) return;
@@ -127,10 +138,10 @@ public class PistonCalculator implements Listener {
 
     @AllArgsConstructor
     @Getter
-    @ToString
     private static class CalculationResult {
         private int amount;
         private boolean tooMany;
         private boolean unmovable;
+        private REntityServer entityServer;
     }
 }