Impossible trident: Difference between revisions
m move left |
Lembit Staan (talk | contribs) No edit summary |
||
| Line 1: | Line 1: | ||
[[File:Poiuyt--opaque.svg|thumb|right|A blivet with backgrounds, to enhance the illusion]] |
[[File:Poiuyt--opaque.svg|thumb|right|A blivet with backgrounds, to enhance the illusion]] |
||
[[File:RogerHaywardUndecidable Monument.jpg|thumb|right|Hayward's "undecidable monument"]] |
[[File:RogerHaywardUndecidable Monument.jpg|thumb|right|Hayward's "undecidable monument"]] |
||
An '''impossible trident''',<ref>Andrew M. Colman, ''A Dictionary of Psychology'', Oxford University Press, 2009, ISBN 0199534063, [https://books.google.com/books?id=XxGbsjKjPZsC&pg=PA369 p. 369]</ref> also known as an '''impossible fork''',<ref>[http://mathworld.wolfram.com/ImpossibleFork.html Article "Impossible Fork"] at MathWorld</ref> a '''blivet''', |
An '''impossible trident''',<ref>Andrew M. Colman, ''A Dictionary of Psychology'', Oxford University Press, 2009, ISBN 0199534063, [https://books.google.com/books?id=XxGbsjKjPZsC&pg=PA369 p. 369]</ref> also known as an '''impossible fork''',<ref>[http://mathworld.wolfram.com/ImpossibleFork.html Article "Impossible Fork"] at MathWorld</ref> a '''blivet''',<ref>''[[The Hacker's Dictionary]]'', article "Blivet"; It lists the impossible fork among numerous meanings of the term</ref> '''poiuyt''', '''devil's fork'''{{cn|date=March 2016}} is a drawing of an [[impossible object]] (undecipherable figure), a kind of an [[optical illusion]]. It appears to have three cylindrical prongs at one end which then mysteriously transform into two rectangular prongs at the other end. |
||
The graphic artist [[M. C. Escher]] used these types of figures as the basis for impossible three-dimensional compositions in many of his woodcut prints.{{cn|date=March 2016}} |
The graphic artist [[M. C. Escher]] used these types of figures as the basis for impossible three-dimensional compositions in many of his woodcut prints.{{cn|date=March 2016}} |
||
Revision as of 20:45, 14 March 2016
An impossible trident,[1] also known as an impossible fork,[2] a blivet,[3] poiuyt, devil's fork[citation needed] is a drawing of an impossible object (undecipherable figure), a kind of an optical illusion. It appears to have three cylindrical prongs at one end which then mysteriously transform into two rectangular prongs at the other end.
The graphic artist M. C. Escher used these types of figures as the basis for impossible three-dimensional compositions in many of his woodcut prints.[citation needed]
The word "poiuyt" appeared on the March 1965 cover[4] of Mad magazine bearing the caption "Introducing 'The Mad Poiuyt' " (the last six letters on the top row of many Latin-script typewriter keyboards, right to left), and has appeared numerous times since then. An anonymously-contributed version described as a "hole location gauge" was printed in the June 1964 issue of Analog Science Fiction and Fact, with the comment that "this outrageous piece of draftsmanship evidently escaped from the Finagle & Diddle Engineering Works" (although something else called a "hole location gauge" had already been patented in 1961[5]).
In December 1968 American optical designer and artist Roger Hayward wrote "Blivets: Research and Development" for The Worm Runner's Digest in which he presented interpretations of the blivet.[6]
Notes
- ^ Andrew M. Colman, A Dictionary of Psychology, Oxford University Press, 2009, ISBN 0199534063, p. 369
- ^ Article "Impossible Fork" at MathWorld
- ^ The Hacker's Dictionary, article "Blivet"; It lists the impossible fork among numerous meanings of the term
- ^ "Doug Gilford's Mad Cover Site - Mad #93". Madcoversite.com. Retrieved 2010-10-22.
- ^ "Hole location gauge - Patent 2998656". Freepatentsonline.com. 1961-09-05. Retrieved 2010-10-22.
- ^ Gardner, Martin (1981). Mathematical Circus. Pelican Books. p. 5.
External links
Definitions from Wiktionary
Media from Commons
| Illusions |
|  |
|---|---|---|
| Popular culture |
| |
| Related | ||