As we all have witnessed, the Compiz's Desktop Cube has brought a great deal of popularity to Ubuntu, and, with the introduction and implementation of Unity-shell 3D, Desktop Cube could't anymore be used in Natty.
Yes, but, why?
Unity was depending on "Desktop Wall" and, by simply selecting "Desktop Cube", Unity was disabled.
Many we-want-the-cube-back related complains have been expressed, "forcing" developers to find a simply, yet smart trick, to allow the cube to be functional under Unity.