Impossible object
Type of optical illusion / From Wikipedia, the free encyclopedia
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For John Frankenheimer's film, see Impossible Object. For the independent rock band, see The Impossible Shapes.
An impossible object (also known as an impossible figure or an undecidable figure) is a type of optical illusion that consists of a two-dimensional figure which is instantly and naturally understood as representing a projection of a three-dimensional object but cannot exist as a solid object. Impossible objects are of interest to psychologists, mathematicians and artists without falling entirely into any one discipline.