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[[Image:Orbison.gif|thumb|right|225px|'''Orbison illusion''']]
[[Image:Orbison illusion.svg|thumb|right|Orbison illusion consisting of a square placed over radial lines.]]
The '''Orbison illusion''' (or '''Orbison's illusion''') is an [[optical illusion]] first described by American psychologist [[William Orbison]] (1912&ndash;1952)<ref name=DOPT>{{cite book|last=Roeckelein|first=Jon E.|date=2006|title=Elsevier's Dictionary of Psychological Theories|url=https://books.google.com/books?id=1Yn6NZgxvssC&q=william+orbison+psychologist&pg=PA651|location=Amsterdam|publisher=Elsevier|page=651|isbn=9780444517500}}</ref> in 1939.


The illusion consists of a two dimensional figure, such as a [[circle]] or [[square]], superimposed over a background of [[radial line]]s or [[concentric|concentric circle]]s. The result is an optical illusion in which both the figure and the [[rectangle]] which contains it appear distorted; in particular, squares appear slightly bulged, circles appear [[ellipse|elliptical]], and the containing rectangle appears tilted.<ref name=OII>{{cite web|url=http://www.optical-illusions.info/illusions/Orbison_illusion.htm|title=Orbison illusion|website=opticalillusions.info|access-date=June 30, 2016|archive-url=https://web.archive.org/web/20161007173234/http://www.optical-illusions.info/illusions/Orbison_illusion.htm|archive-date=October 7, 2016|url-status=dead}}</ref>
The '''Orbison illusion''' is an [[optical illusion]] that was first described by the psychologist [[William Orbison]] in 1939. The bounding rectangle and inner square both appear distorted in the presence of the radiating lines. The background gives us the impression there is some sort of perspective. As a

result, our brain sees the shape distorted. This is a variant of the [[Hering illusion|Hering]] and [[Wundt illusion]]s.
==References==
{{reflist}}
{{refbegin}}
*{{cite book|last=Fineman|first=Mark|title=The Nature of Visual Illusion|publisher=Dover Publications|pages=[https://archive.org/details/natureofvisualil0000fine/page/152 152-153]|date=1996|isbn=0486291057|url=https://archive.org/details/natureofvisualil0000fine/page/152}}
*{{cite book|last=Robinson|first=J.O.|title=The Psychology of Visual Illusion|publisher=Dover Publications|pages=72–73|date=1998|isbn=978-0486404493}}
{{refend}}


==External links==
==External links==
* {{cci}}
{{Commons|Optical illusion}}

* [http://www.optical-illusion.org/?s=432 Square is perfect; the sides are not bent]
{{Optical illusions}}


[[Category:Optical illusions]]
[[Category:Optical illusions]]


{{psych-stub}}

Latest revision as of 23:34, 28 April 2024

Orbison illusion consisting of a square placed over radial lines.

The Orbison illusion (or Orbison's illusion) is an optical illusion first described by American psychologist William Orbison (1912–1952)[1] in 1939.

The illusion consists of a two dimensional figure, such as a circle or square, superimposed over a background of radial lines or concentric circles. The result is an optical illusion in which both the figure and the rectangle which contains it appear distorted; in particular, squares appear slightly bulged, circles appear elliptical, and the containing rectangle appears tilted.[2]

References

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  1. ^ Roeckelein, Jon E. (2006). Elsevier's Dictionary of Psychological Theories. Amsterdam: Elsevier. p. 651. ISBN 9780444517500.
  2. ^ "Orbison illusion". opticalillusions.info. Archived from the original on October 7, 2016. Retrieved June 30, 2016.
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