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Ask A Scientist: What is an Optical Illusion

Optical illustions are fun because they show us that sometimes we can't believe our eyes. But they are also useful to show us how our eyes and our brains need to work together to help us make sense of the world. In this video Dr. Matt McMahon demonstrates an optical illusion that can fool the eyes into thinking that two objects are different sizes, when actually they are identical. 

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AAAS