Optical Illusion
This was posted recently on the reddit.com site. Pretty interesting.

Both squares A & B are the same shade of gray!
Impossible you say? Check here for proof and there is also an explanation link. If you don't mind looking dorky, use your hands or a couple pieces of paper and block out everything on the left and right sides of the squares and you'll see it's true.

Both squares A & B are the same shade of gray!
Impossible you say? Check here for proof and there is also an explanation link. If you don't mind looking dorky, use your hands or a couple pieces of paper and block out everything on the left and right sides of the squares and you'll see it's true.