Beware of the following link – it’s way awesome, but will seriously mess with your head. I got the link to this really awesome optical illusion page courtesy of Boing Boing. I think that first one of “Rotating Snakes” is amazing – I was sure it was a Flash animation or something.
As an additional link, here’s the Cool Person Test. I think I got this while surfing commentary on the Avrilution, but there will certainly be more on that later.