Martin Gardner's April Fool's Map

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In a map coloring, adjacent regions have different colors. According to the four-color theorem, only four colors are needed to color any map. The map shown here was introduced for the first time by Martin Gardner in 1975 [1]. You can color it by clicking the polygons; clicking the same polygon repeatedly cycles through the colors.

Contributed by: Enrique Zeleny (August 2012)
Open content licensed under CC BY-NC-SA




[1] M. Gardner, "Mathematical Games: Six Sensational Discoveries That Somehow or Another Have Escaped Public Attention," Scientific American, 232(4), pp. 127–131, 1975.

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