3D-Desktop is an OpenGL program for switching virtual desktops in a seamless 3-dimensional manner on Linux. The current desktop is mapped into a fullscreen 3D environment where you may choose other screens. Several different visualization modes are available.
The transition from working desktop to fullscreen 3D environment is seamless. In other words when the pager activates you see your current desktop appear to zoom out to a point in space where you can see your other virtual desktops allowing you to select another. The best way to understand is to try it out and get the full effect!