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Kendra Cherry

Ponzo Illusion - Psychology Definition of the Week

By July 30, 2010

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Definition: The Ponzo illusion is an optical illusion that was first described in 1913 by an Italian psychologist named Mario Ponzo. He suggested that people judge the size of an object based on the background. In the Ponzo illusion, two identically-sized lines appear to be different sizes when placed over parallel lines that seem to converge as they recede into the distance. Learn more about the Ponzo illusion.

More Optical Illusions:

Image from Wikimedia Commons


August 6, 2010 at 4:38 am
(1) Associated Counsellors & Psychologists Sutherland says:

you guys are awesome

December 29, 2011 at 6:32 am
(2) Sydney & Australia Counselling Directory says:

Thanks for defining this fascinating phenomenon!

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