Pretty Amazing Optical Illusion

Some of you may have seen this one already

[atadams]

[www-bcs.mit.edu...]

[JonB]

this one is really amazing.I rememebr i posted this on WebmasterWorld some months ago. i checked in psp aand everything and it is still amazing :)

[mivox]

Heheh. Yeah... everyone who checked it out last time posted something like, "I couldn't believe it, so I opened it in PSP/Photoshop/etc., and had to double check." Including me. :) Amazing stuff.

[Timotheos]

Thanks atadams. That's cool. I must have missed it the first time around.

[ncsuk]

My brain just started hurting..!