17 Mind-Mangling Optical Illusion GIFs

Don't believe what your eyes tell you.

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2. Move your eyes above this line and the black and white dots will look like they're rotating clockwise.

moillusions.com

But focus on the central red or yellow dots and the outer ones reverse to show their true direction – counter-clockwise.

Nope, they're all the same.

Via neatorama.com!niCTK

This is an example of the Ponzo illusion. Italian psychologist Mario Ponzo suggested that we judge an object's size based on its background. So if something is the same size as another object but looks "further away" because of the background, we'll think it's bigger.