Bad Astronomy Another brain-frying optical illusion: What color

The spheres in an optical illusion appear to be different colors, but they are actually all the same.

Daily Discovery: Optical Illusions & Color Vision - Fort Collins Museum of Discovery

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The optical illusion that tricks your brain into seeing colour, The Independent

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Psych, Free Full-Text

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Tetris effect - Wikipedia

Color Illusions and Color Blind Tests

optical illusion, SYFY WIRE

The optical illusion that tricks your brain into seeing colour, The Independent