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How many sides to this box? What can you put into it?
How many black dots can you count?
Watch the animation:

How many black dots can you count?

Watch the animation:

So, the diamonds on the bottom are much lighter than the diamonds on top, right? Wrong! Actually -- and you probabbly have guessed this optical illusion by now -- all the diamonds in the picture are eactly the same. It's our eyes playing tricks on us! Maybe that's why diamonds are a girl's best friend?
