My tiny mind is blown 
Talk about some cool optical illusions. Check out Akiyoshi's illusion pages. There's nothing fancy here, just some good old fashioned optical illusions. But be warned, they will blow your mind. They are completely stationary, but they look like they're moving. I've stared at them for a solid 20 minutes and I can't figure it out, but I can't get enough either. Pure craziness.