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.
- Reference to the illusion in World of Wonders; A Record of Things wonderful in Nature, Science and Art, Cassel, Petter & Galpin, London, 1873, p. 11.
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