Poggendorff illusion

noun
Pog·​gen·​dorff illusion | \ˈpägənˌdȯrf-\

Definition of Poggendorff illusion 

: an apparent deflection of a straight line when it is interrupted by two lines parallel to each other

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History and Etymology for Poggendorff illusion

after Johann C. Poggendorff †1877 German physicist

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