Compiz-Fusion, as you surely know is responsible for eye candy on GNU/Linux distros such as windows that turn into paper airplanes when the user minimizes it to turning the desktop into a spinning cube.  There’s something about the wobbly windows that provides some a sense of inertia that just makes things feel a little more dynamic on the desktop.  I can’t explain it, but some of the effects make the GUI slightly more useful.  However, Compiz-Fusion isn’t perfect.