diff --git a/src/main/java/com/sk89q/worldedit/WorldEdit.java b/src/main/java/com/sk89q/worldedit/WorldEdit.java
index 754a67d9f..da88f289e 100644
--- a/src/main/java/com/sk89q/worldedit/WorldEdit.java
+++ b/src/main/java/com/sk89q/worldedit/WorldEdit.java
@@ -403,33 +403,50 @@ public class WorldEdit {
      * blocks to include when replacing.
      * 
      * @param player
-     * @param list
+     * @param maskString
      * @return
      * @throws UnknownItemException
      * @throws DisallowedItemException
      */
-    public Mask getBlockMask(LocalPlayer player, String list)
+    public Mask getBlockMask(LocalPlayer player, String maskString)
             throws UnknownItemException, DisallowedItemException {
-        if (list.charAt(0) == '#') {
-            if (list.equalsIgnoreCase("#existing")) {
-                return new ExistingBlockMask();
+        Mask mask = null;
+        
+        for (String component : maskString.split(" ")) {
+            Mask current = null;
+            
+            if (component.charAt(0) == '#') {
+                if (component.equalsIgnoreCase("#existing")) {
+                    current = new ExistingBlockMask();
+                } else {
+                    throw new UnknownItemException(component);
+                }
             } else {
-                throw new UnknownItemException(list);
+                if (component.charAt(0) == '!' && component.length() > 1) {
+                    current = new InvertedBlockTypeMask(
+                            getBlockIDs(player, component.substring(1), true));
+                } else {
+                    current = new BlockTypeMask(getBlockIDs(player, component, true));
+                }
             }
-        } else {
-            if (list.charAt(0) == '!' && list.length() > 1) {
-                return new InvertedBlockTypeMask(
-                        getBlockIDs(player, list.substring(1), true));
+            
+            if (mask == null) {
+                mask = current;
+            } else if (mask instanceof CombinedMask) {
+                ((CombinedMask) mask).add(current);
             } else {
-                return new BlockTypeMask(getBlockIDs(player, list, true));
+                mask = new CombinedMask(mask);
+                ((CombinedMask) mask).add(current);
             }
         }
+        
+        return mask;
     }
 
     /**
      * Get a list of blocks as a set.
      *
-     *@param player
+     * @param player
      * @param list
      * @param allBlocksAllowed
      * @return set
diff --git a/src/main/java/com/sk89q/worldedit/commands/ToolUtilCommands.java b/src/main/java/com/sk89q/worldedit/commands/ToolUtilCommands.java
index aa1e71610..fcd3ddbab 100644
--- a/src/main/java/com/sk89q/worldedit/commands/ToolUtilCommands.java
+++ b/src/main/java/com/sk89q/worldedit/commands/ToolUtilCommands.java
@@ -87,7 +87,7 @@ public class ToolUtilCommands {
             session.getBrushTool(player.getItemInHand()).setMask(null);
             player.print("Brush mask disabled.");
         } else {
-            Mask mask = we.getBlockMask(player, args.getString(0));
+            Mask mask = we.getBlockMask(player, args.getJoinedStrings(0));
             session.getBrushTool(player.getItemInHand()).setMask(mask);
             player.print("Brush mask set.");
         }
diff --git a/src/main/java/com/sk89q/worldedit/masks/CombinedMask.java b/src/main/java/com/sk89q/worldedit/masks/CombinedMask.java
new file mode 100644
index 000000000..166a21251
--- /dev/null
+++ b/src/main/java/com/sk89q/worldedit/masks/CombinedMask.java
@@ -0,0 +1,60 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010, 2011 sk89q <http://www.sk89q.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit.masks;
+
+import java.util.ArrayList;
+import java.util.List;
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.Vector;
+
+public class CombinedMask implements Mask {
+    
+    private List<Mask> masks = new ArrayList<Mask>();
+    
+    public CombinedMask() {
+    }
+    
+    public CombinedMask(Mask mask) {
+        masks.add(mask);
+    }
+    
+    public void add(Mask mask) {
+        masks.add(mask);
+    }
+    
+    public boolean remove(Mask mask) {
+        return masks.remove(mask);
+    }
+    
+    public boolean has(Mask mask) {
+        return masks.contains(mask);
+    }
+
+    public boolean matches(EditSession editSession, Vector pos) {
+        for (Mask mask : masks) {
+            if (!mask.matches(editSession, pos)) {
+                return false;
+            }
+        }
+        
+        return true;
+    }
+
+}