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An impossible trident, [1] also known as an impossible fork, [2] blivet, [3] poiuyt, or devil's tuning fork, [4] 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.

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An impossible trident, [1] also known as an impossible fork, [2] blivet, [3] poiuyt, or devil's tuning fork, [4] 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.

Apr 8, 2025 · The impossible fork (Seckel 2002, p. 151), also known as the devil's pitchfork (Singmaster), blivet, or poiuyt, is a classic impossible figure originally due to Schuster (1964).

Apr 21, 2013 · A blivet, also known as a poiuyt or even more often refereed to as “The Devil’s Fork” is an undecipherable figure, an optical illusion and an impossible object we’ve encountered many times here on Mighty Optical Illusions blog – yet I feel we’ve never given it proper attention, explained how it works nor talked how it came to be…

A blivet, also known as a poiuyt, devil's fork or widget, is an undecipherable figure, an optical illusion and an impossible object. It appears to have three cylindrical prongs at one end which then mysteriously transform into two rectangular prongs at the other end.

Aug 17, 2002 · The poiuyt is an optical illusion made famous by MAD Magazine. It has also been called the tri-pronged u-bar, and most engineers know it by the name of blivet. The poiuyt was first exposed to the masses in MAD #93, the March issue of 1965.

Dec 16, 2011 · The three-stick clevis has since gone by many other names: blivet, devil's tuning fork, widget, and poiuyt. Mad Magazine used "poiuyt" as the name for the above blivet when they featured it on their March 1965 cover.