Saw these cool rotating illusions linked to on Boing Boing. Maybe I'll make one of them my background to keep all but the staunchest visitors away.

I really liked the black hole illusion, but then I viewed it on a different, smaller screen and it didn't work anymore. Oh well, the pincushion illusiono is very similar. For more illusions you can also check out Illusions and Demos by Ted Adelson.