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Optical illusions

On National Geographic there is right now a science show called Brain Games. Even though a lot of the contents is not new, there was one optical illusion which really fascinated me:

Which direction are the black and white balls moving?

Which direction are the black and white balls moving?

Look at the full image, look at the red circle, look at the yellow circle…

(image found at Mighty Optical Illusions)

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