Optical illusion!

Ok, this is freaking awesome. Look at the picture above-do you see a girl spinning on one leg?

Do you see her as spinning in the clockwise direction or anti-clockwise direction?

Well, it's actually up to your control whichever way she spins! :D

It's no computer effect or whatsoever trick at all! It's a freaking hard optical illusion! I saw it turning in the clockwise direction first, then had to stare for about 5min before I saw it turning in the anti-clockwise direction, then had to stare for even longer (less than 10min la) to see it turn back in the clockwise direction again. So after a few times, I can see it turning whichever way I want in less than 5 seconds! :p

SO freaking amazing!! Hahaha. This is supposed to be how it works:
The spinning girl is a form of the more general spinning silhouette illusion. The image is not objectively “spinning” in one direction or the other. It is a two-dimensional image that is simply shifting back and forth. But our brains did not evolve to interpret two-dimensional representations of the world but the actual three-dimensional world. So our visual processing assumes we are looking at a 3-D image and is uses clues to interpret it as such. Or, without adequate clues it may just arbitrarily decide a best fit – spinning clockwise or counterclockwise. And once this fit is chosen, the illusion is complete – we see a 3-D spinning image.


By looking around the image, focusing on the shadow or some other part, you may force your visual system to reconstruct the image and it may choose the opposite direction, and suddenly the image will spin in the opposite direction.
-Taken from http://www.theness.com/neurologicablog/?p=27.

Haha. Cool stuff. I'm still amazed!!