I smiled when I remembered the spherical trigonometry course taught at Glasgow University by Archie Roy. The group of us sitting in front of him in 1969 took weeks to realise why we could not keep up, before noticing that Archie was drawing the circles with his left hand, writing with his right, and explaining everything all at once. It was no mean task just to keep up with your notes, limited to a single hand. We, poor souls, lacked Archie's gifts, but appreciated his sly mischievousness. Great circles; great man.
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