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Dr Ed Connor tells Brett Westwood how he used a computer programme to demonstrate why we find an egg such a visually pleasing three-dimensional shape: "An unbroken egg is perfect in the sense of a smooth convex curvature and as soon as you break an egg, it ceases to have that perfection of surface shape and of course, it also ceases to be desirable." Photograph © The Trustees of the Natural History Museum, London.