Jastrow illusion
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The Jastrow illusion is an optical illusion discovered by the American psychologist Joseph Jastrow in 1889. In this illustration, the two figures are identical, although the lower one appears to be larger. The short edge of the upper figure is compared to the long side of the lower one.[1]
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With their left sides aligned, the lower figure appears larger
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Shifting the upper figure to the right reveals their identical sizes
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