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.

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What color are the circles? Viral optical illusion baffles the internet

Op-Ed: A writer (literally) loses her voice - Los Angeles Times

Impossible colors (with a yellow-blue example - try to see it by crossing your eyes) : r/science

Individuals who use psychedelic substances like LSD and psilocybin may experience a significant increase in unusual visual phenomena, such as seeing patterns or intense colors that are not there : r/science

Magic mushrooms' effects illuminated in brain imaging studies. : r/science

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

Bad Astronomy, Another brain-frying optical illusion: What color are these spheres?