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Fantastic TED talk on what optical illusions tell us about how we see.

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Beau Lotto: Optical illusions show how we see

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Beau Lotto's color games puzzle your vision, but they also spotlight what you can't normally see: how your brain works. This fun, first-hand look at your own versatile sense of sight reveals how evolution tints your perception of what's really out there.

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Ames Rooms (Now we know how the Hobbit Houses worked :))

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How to construct a miniature optical illusion room. Setups like this were used in 'The Lord of the Rings' trilogies to make people look like giants or dwarfs.

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The Dot Illusion (move this to see what's so cool about this one)

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If your eyes follow the movement of the rotating pink dot, you will only see one color, pink. If you stare at the black + in the center, the moving dot turns to green. Now, concentrate on the black + in the center of the picture.

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Wind Spinners (Move this post to see what's so cool about this one.)

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The Ball's in these spinners are not attached. you can remove them. but the diameter of the spinner at the location of the ball is just small enough that the ball does not fall through. These were being sold by a vendor at the Carlsbad, Flower fields. April 2012

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Stare into the center. This is not a prank, so no scary popups.

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The Monkey Business Illusion (this one is my favorite)