Abstract
When the “Mathematical Lens” editors walked a mathematics trail in and around the San Francisco Museum of Modern Art several years ago, we marveled at the architecture—in particular, a central, open cylindrical column truncated at an angle (see photographs 1 and 2)—and considered the mathematics of the cross section. Since then, we received a photograph of the Shafran Planetarium at the Cleveland (Ohio) Museum of Natural History, taken by Julian D'Angela, a mathematics teacher in Hamilton, Ontario (see photograph 3), that shows a conical structure cut by a plane. Editor Bentele took more photographs of San Francisco structures truncated at varying angles and considered further the mathematics involved.
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