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@Pierre_Tranche: Inside a federal building in San Francisco during #NCTMannual. #mathphoto16 #symmetry https://t.co/jXZUeIDd6n | by tads2

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@Pierre_Tranche: Inside a federal building in San Francisco during #NCTMannual. #mathphoto16 #symmetry https://t.co/jXZUeIDd6n

Inside a federal building in San Francisco during #NCTMannual. #mathphoto16 #symmetry t.co/jXZUeIDd6n - @Pierre_Tranche

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Uploaded on June 12, 2016