diff --git a/src/java/com/threerings/miso/client/DirtyItemList.java b/src/java/com/threerings/miso/client/DirtyItemList.java
index 8297371f..b8556b79 100644
--- a/src/java/com/threerings/miso/client/DirtyItemList.java
+++ b/src/java/com/threerings/miso/client/DirtyItemList.java
@@ -281,7 +281,7 @@ public class DirtyItemList
             this.oy = y;
 
             // calculate the item's leftmost and rightmost tiles; note
-            // that sprites occupy only a single tile, so leftmost and
+            // that normal (Non-MultiTile) sprites occupy only a single tile, so leftmost and
             // rightmost tiles are equivalent
             lx = rx = ox;
             ly = ry = oy;
@@ -289,6 +289,10 @@ public class DirtyItemList
                 ObjectTile tile = ((SceneObject)obj).tile;
                 lx -= (tile.getBaseWidth() - 1);
                 ry -= (tile.getBaseHeight() - 1);
+            } else if (obj instanceof MultiTileSprite) {
+                MultiTileSprite mts = (MultiTileSprite)obj;
+                lx -= (mts.getBaseWidth() - 1);
+                ry -= (mts.getBaseHeight() - 1);
             }
         }
 
@@ -457,7 +461,7 @@ public class DirtyItemList
                 }
                 return result;
             }
-            
+
             // check for partitioning objects on the x-axis
             result = comparePartitioned(X_AXIS, da, db);
             if (result != 0) {
diff --git a/src/java/com/threerings/miso/client/MultiTileSprite.java b/src/java/com/threerings/miso/client/MultiTileSprite.java
new file mode 100644
index 00000000..aa1bbc49
--- /dev/null
+++ b/src/java/com/threerings/miso/client/MultiTileSprite.java
@@ -0,0 +1,33 @@
+//
+// $Id$
+//
+// Nenya library - tools for developing networked games
+// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/nenya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.miso.client;
+
+public interface MultiTileSprite
+{
+    /** Returns the number of tiles the sprite occupies along the x-axis.  Note that the origin is
+     * defined to be the tile with the maximal x & y coordinates. */
+    public int getBaseWidth ();
+
+    /** Returns the number of tiles the sprite occupies along the y-axis.  Note that the origin is
+     * defined to be the tile with the maximal x & y coordinates. */
+    public int getBaseHeight ();
+}