Proof? Compare square A and B.
Are they the same color?
Do not believe me.
Print the image out on a color printer, then fold or cut the squares next to each other.
They are the same color. You cannot believe your eyes. Or your ears. Because our perception of the truth, of fact, is based on clues and beliefs we bring with us when we look or listen.
Try it for yourself.
From Lateral Action (click here).