Can’t Imagine Shapes in 4 Dimensions? Just Print Them Out

Last spring, mathematician Henry Segerman found a peculiar post on Facebook. It was by a programmer who had could not conjure mental images—a condition called aphantasia. Segerman immediately recognized that he lives with the same limitation. “When I try to visualize something, I don’t see anything,” he says. Which is curious—because Segerman, 37, has made a career out of visualizing complex mathematical shapes.

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