Ehrenstein illusion
The Ehrenstein illusion is an optical illusion studied by the German psychologist de (1899 – 1961) in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape (Figure 1).[1][2]
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Ehrenstein illusion (1)
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Ehrenstein2.gif
Illusion (2)
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Ehrenstein figure.svg
Illusion (3); adding a circle (bottom) destroys the illusion of a bright central disk.
Sometimes the name "Ehrenstein" is associated with one of the illusory contour figures (Figure 2).[3][4][5] The ends of the dark segments produce the illusion of circles. The apparent figures have the same color as the background, but appear brighter. A similar effect is obtained in the Kanizsa triangle.
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- ↑ A catalogue of illusions at Ritsumeikan University
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- ↑ Ehrenstein illusion at Scholarpedia
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