Campanus's Sphere

In proposition 17, book XII, Euclid constructed a polyhedron with rings, each consisting of faces. The special case, , was constructed by Campanus and is a 72-faced polyhedral sphere. During the Renaissance, it was as popular as the Platonic solids [1].


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[1] P. R. Cromwell, Polyhedra, New York: Cambridge University Press, 1999 pp. 106–107.
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