Ehrenstein illusion
The Ehrenstein illusion is an optical illusion studied by the German psychologist Walter Ehrenstein (1899 – 1961) in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape.[1][2]
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Original Ehrenstein illusion, where a square appears curved when placed inside of concentric circles -
Alternative Ehrenstein illusion, where the ends of the dark segments produce the illusion of circles -
The illusion of a bright central disk (above) is destroyed by adding a circle (bottom).
Sometimes the name "Ehrenstein" is associated with one of the illusory contour figures where the ends of the dark segments produce the illusion of circles.[3][4][5] The apparent figures have the same color as the background, but appear brighter. A similar effect is obtained in the Kanizsa triangle.
References
Wikimedia Commons has media related to Ehrenstein illusion.
- ^ A catalogue of illusions at Ritsumeikan University
- ^ W. Ehrenstein (1925). "Versuche über die Beziehungen zwischen Bewegungs- und Gestaltwahrnehmung" [Experiments on the Relationships Between the Perception of Motion and of Gestalt]. Zeitschrift für Psychologie. 96: 305–352.
{{cite journal}}: Cite has empty unknown parameter:|month=(help) - ^ Ehrenstein illusion at Scholarpedia
- ^ W. Ehrenstein (1941). "Über Abwandlungen der L. Hermannschen Helligkeitserscheinung". Zeitschrift für Psychologie. 150: 83–91.
{{cite journal}}: Cite has empty unknown parameter:|month=(help) - ^ W. Ehrenstein (1954). Probleme der ganzheitspsychologischen Wahrnehmungslehre. Leipzig: Barth.
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