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Three-Arc Illusion


The larger an arc is, the smaller its radius appears. For example, the three arcs illustrated above belong circles of the same radius.

This entry contributed by Margherita Barile


Carraher, R. G. and Thurston, J. B. Optical Illusions and the Visual Arts. New York: Reinhold, 1966.


Barile, Margherita. "Three-Arc Illusion." From MathWorld–A Wolfram Web Resource, created by Eric W. Weisstein.


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