Orbison illusion

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]

## Further examples

* Square distortion by concentric circles

Square distortion by concentric circles

* Circle distortion by radial lines

Circle distortion by radial lines

* Square distortion by beams

Square distortion by beams

## References

1. ↑ Roeckelein, Jon E. (2006). Elsevier's Dictionary of Psychological Theories. Amsterdam: Elsevier. p. 651. ISBN 9780444517500. https://books.google.com/books?id=1Yn6NZgxvssC&q=william+orbison+psychologist&pg=PA651.
2. ↑ "Orbison illusion". http://www.optical-illusions.info/illusions/Orbison_illusion.htm.

* Fineman, Mark (1996). The Nature of Visual Illusion. Dover Publications. pp. 152-153. ISBN 0486291057. https://archive.org/details/natureofvisualil0000fine/page/152.
* Robinson, J.O. (1998). The Psychology of Visual Illusion. Dover Publications. pp. 72–73. ISBN 978-0486404493.

## External links

* Template:Cci

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Optical illusions (list)

Illusions|

* Afterimage
* Ambiguous image
* Ames room
* Barberpole
* Bezold
* Café wall
* Checker shadow
* Chubb
* Cornsweet
* Delboeuf
* Ebbinghaus
* Ehrenstein
* Flash lag
* Fraser spiral
* Gravity hill
* Grid
* Hering
* Impossible trident
* Jastrow
* Lilac chaser
* Mach bands
* McCollough
* Müller-Lyer
* Necker cube
* Orbison
* Penrose stairs
* Penrose triangle
* Peripheral drift
* Poggendorff
* Ponzo
* Rubin vase
* Sander
* Schroeder stairs
* Shepard tables
* Spinning Dancer
* Ternus
* Vertical–horizontal
* White's
* Wundt
* Zöllner

Popular culture|

* Op art
* Trompe-l'œil
* Spectropia (1864 book)
* Ascending and Descending (1960 drawing)
* Waterfall (1961 drawing)
* The dress (2015 photograph)

Related|

* Auditory illusions
* Tactile illusions
* Temporal illusion

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