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\begin{figure}\begin{center}\BoxedEPSF{Tribar.epsf scaled 1000}\end{center}\end{figure}

An Impossible Figure published by R. Penrose (1958). It also exists as a Tribox.


Draper, S. W. ``The Penrose Triangle and a Family of Related Figures.'' Perception 7, 283-296, 1978.

Fineman, M. The Nature of Visual Illusion. New York: Dover, p. 119, 1996.

Jablan, S. ``Set of Modular Elements `Space Tiles'.''

Pappas, T. ``The Impossible Tribar.'' The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 13, 1989.

Penrose, R. ``Impossible Objects: A Special Type of Visual Illusion.'' Brit. J. Psychology 49, 31-33, 1958.

© 1996-9 Eric W. Weisstein