Alright, so I run Ubuntu 7.10 and use the Desktop Effects via compviz, anyhow, I could get the 2d workspace but really wanted the 3d cube, even if I set up 4 desktops, it would still only show 2 sides of the cube(aka not a cube).

The solution is: In Terminal do: gconftool-2 --type int --set /apps/compiz/general/screen0/options/hsize 4

😉