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Illusory Contour Figures


IllusoryContourFigures

Radial line segments whose inward-pointing end produce the illusion of a circle or other figure. The apparent figure has the same color as the background, but appears brighter. A similar effect is obtained in the Kanizsa triangle.

IllusoryEhrenstein

The contour illusion above is sometimes known as the Ehrenstein illusion.


See also

Ehrenstein Illusion, Kanizsa Triangle

This entry contributed by Margherita Barile

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References

McCourt, M. "Ehrenstein Illusion." http://www.psych.ndsu.nodak.edu/mccourt/Projects/Brightness/Ehrenstein/Ehrenstein.htm.Smith-Kettlewell Eye Research Institute. "Circles That Aren't There." http://www.ski.org/CWTyler_lab/LHardage/General/Ehrenst.html.

Referenced on Wolfram|Alpha

Illusory Contour Figures

Cite this as:

Barile, Margherita. "Illusory Contour Figures." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/IllusoryContourFigures.html

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