An illusion in which the eye alternately sees two black faces, or a white goblet.
Goblet Illusion
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References
Fineman, M. The Nature of Visual Illusion. New York: Dover, pp. 111 and 115, 1996.Kid's World. "Optical Illusions--2." http://www.frontiernet.net/~docbob/ilusion2.htm."Reversible Goblet." http://www.nari.ee.ethz.ch/nari_lectures/bildkom/Studenten_Projekte/Sommer96/Projekt5/sub1/goblet.htmlRubin, E. Synoplevede Figurer. Copenhagen, Denmark: Gyldendalske, 1915.SandlotScience. "Reversible Goblet." http://www.sandlotscience.com/Ambiguous/Reversible_goblet.htm.Van den Bergh, S. "Amazing Art: Ambiguous Art." http://members.lycos.nl/amazingart/E/1.html.What's Up with Kids Magazine. "Reversible Goblet." http://wuwk.spurtek.com/COI_reversible_goblet.htmReferenced on Wolfram|Alpha
Goblet IllusionCite this as:
Weisstein, Eric W. "Goblet Illusion." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GobletIllusion.html