b'Last spring, mathematician Henry Segerman found a peculiar post on Facebook. It was by a programmer who had could not conjure mental images\\u2014a condition called aphantasia. Segerman immediately recognized that he lives with the same limitation. \\u201cWhen I try to visualize something, I don\\u2019t see anything,\\u201d he says. Which is curious\\u2014because Segerman, 37, has made a career out of visualizing complex mathematical shapes.\\nLearn more about your ad choices. Visit podcastchoices.com/adchoices'