I've always enjoyed optical illusions. This is one of the better one's I've come across. Check it out, and I'll explain it below.
Which is the darker square, A or B?
Answer: They're the exact same shade of gray. The mind can be easily tricked with patterns, and in this case your mind tells you that the B square is much lighter than the A square. It's not. If you want to see for yourself, open this picture up in paint, crop a piece of each square and place them next to each other. It is the exact same shade of gray. I don't know who Edward Adelson is, but I like his work.
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