Add Yahoo as a preferred source to see more of our stories on Google. Researchers are finding that many of them do experience these perceptual quirks, though not always in the same way. "Illusions ...

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The famous Ebbinghaus illusion, named for its discoverer, the German psychologist Hermann Ebbinghaus (1850–1909). Despite appearances, the two orange circles are the same size. Have you ever looked at ...

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Optical illusions are created by modifying images in such a way that they trick our visual system into believing what it is seeing is real. These illusions have been around for centuries and are also ...