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That one website that shows optical illusions you can play with

Why it's the pick

Michael Bach, a vision scientist, keeps over 150 interactive illusions, each with sliders to play with and a plain explanation of what your brain is doing. It is free and deliberately has no ads.

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Also good

Optical Toys optical.toys Playful illusions like the Thatcher effect and Shepard tone FreeNo signup Link checked Oct 9

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