Can you believe your eyes?

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Below are free to use, class-friendly printouts that provide an optical illusion and an explanation of their behavior. These were originally distributed by ARVO at the USA Science and Engineering Festival.

Find your blind spot

Learn how to make the black spot on this image disappear by closing one eye.

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Negative Afterimage

Turn this black and white image full color by simply staring at it.

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Cone fatigue

Can you make this red and green image change colors?

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