Square A and Square B are the EXACT same shade of gray. The squares are identical, only the letters are different.

Even though I moved the square on photoshop (copy paste) to see that they are indeed identical - - it still appeared that the copied A square was changing shade. Really fascinating.

http://upload.wikimedia.org/wikipedia/commons/6/60/Grey_square_optical_illusion.PNG

http://upload.wikimedia.org/wikipedia/en/2/2b/Illusion-9.gif

Square A and Square B are the EXACT same shade of gray. The squares are identical, only the letters are different.

Even though I moved the square on photoshop (copy paste) to see that they are indeed identical - - it still appeared that the copied A square was changing shade. Really fascinating.

http://upload.wikimedia.org/wikipedia/commons/6/60/Grey_square_optical_illusion.PNG

I never knew optical illusions could be that extreme.

this is quite something! i love this kind of stuff