02-07-2007, 05:36 PM
It is called an "Optical Illusion".
http://web.mit.edu/persci/people/adelson...usion.html
http://en.wikipedia.org/wiki/Optical_illusion
BGnR
http://web.mit.edu/persci/people/adelson...usion.html
http://en.wikipedia.org/wiki/Optical_illusion
BGnR