cube for applications? (not desktops)

I am not sure if I have seen this right on somebody’s desktop. But is it also possible to have a smaller cube on your desktop to select the window/application?
I know you can have a 3D stack and such or all the desktops are on a cube, but maybe it is also possible with windows or at least to have the cube for the desktops in a smaller replication visible.
Thanks a lot.