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Charpentier's illusion

A Dictionary of Psychology

Andrew M. Colman

Charpentier's illusion n. 

Another name for the size-weight illusion. [Named after the French physician (Pierre Marie) Augustin Charpentier (1852–1916) who published an article on it in 1891, although the German psychologists Georg Elias Müller (1850–1934) and Friedrich Schumann (1863–1940) had already discovered and reported the illusion in 1889]