Tribox

Tribox

The tribox, also called the Penrose rectangle or Penrose square, is an impossible figure that is the generalization of the Penrose triangle from a triangle to a square. Similar n-gonal figures can also be constructed for n>4 (Elber).

Devil's pitchfork

The figure above shows three impossible figures: the ambihelical hexnut in the lower left-hand corner, tribox in the middle, and impossible fork in the upper right.

See also

Ambihelical Hexnut, Impossible Figure, Impossible Fork, Impossible Joinery, Penrose Triangle

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References

Elber, G. "Escher for Real." http://www.cs.technion.ac.il/~gershon/EscherForReal/.Jablan, S. "Are Impossible Figures Possible?" https://www.mi.sanu.ac.rs/vismath/jablan/kulpa.htm.Knuth, D. E. §7.2.2.3 in The Art of Computer Programming, Vol. 4. Pre-Fascicle 7A, pp. 14-15, Dec. 5, 2024.

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Cite this as:

Weisstein, Eric W. "Tribox." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Tribox.html

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