I got up from the breakfast table to go to the keyboard and my eyes went to a white mass-market Corelle platter with three ripening peaches on it. The outline of the platter seemed pleasing, and as I looked I realized it was because its oval shape was not just two semicircles joined by straight lines. The sides had some curvature of their own. That curvature seemed “right” to me. There is probably a perfectly ordinary reason for this; familiar living things such as trees, people, and fish tend not to embody severe changes of shape, such as from straight to curve. Curvature tends to be smoothly continuous.