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Bad Astronomy, Another brain-frying optical illusion: What color are these spheres?
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Exploring Digitized Optical Illusions: Design that Messes with our Minds – The Arts Center of the Capital Region
Optical Illusions: Where Science Meets Fun, Even if It Bends the Rules!, by Nicole Akers, Engage
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Optical Illusion: Only highly intelligent people can spot the sheep among these clouds
Daily Discovery: Optical Illusions & Color Vision - Fort Collins Museum of Discovery