Editing Impossible object (section)

{{short description|Type of optical illusion}}
{{for multi|John Frankenheimer's film|Impossible Object|the independent rock band|The Impossible Shapes}}
{{Use dmy dates|date=June 2018}}

[[File:Impossible cube illusion angle.svg|thumb|An [[impossible cube]]—invented by [[M. C. Escher]] for ''[[Belvedere (M. C. Escher)|Belvedere]]'', a [[lithograph]] in which a boy seated at the foot of the building holds an impossible cube<ref>{{cite book |author=Bruno Ernst (Hans de Rijk) |editor1-last=Schattschneider |editor1-first=D. |editor1-link=Doris Schattschneider |editor2-last=Emmer |editor2-first=M. |contribution=Selection is Distortion |pages=5–16 |publisher=Springer |title=M. C. Escher's Legacy: A Centennial Celebration |year=2003 |isbn=978-3-540-28849-7}}</ref><ref>{{Cite book |title=Impossibility: The Limits of Science and the Science of Limits |first=John D |last=Barrow |author-link=John D. Barrow |publisher=Oxford University Press |year=1999 |isbn=9780195130829 |page=14 |url=https://books.google.com/books?id=0jRa1a4pD5IC&pg=PA14 }}</ref>]]
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 [[graphical projection|projection]] of a [[three-dimensional object]] but cannot exist as a solid object. Impossible objects are of interest to [[psychologist]]s, mathematicians and artists without falling entirely into any one discipline.