The processes of science and art can look rather different: a new artistic creation rarely proves an old one wrong; artists rarely look at a scene through microscopes, or understand a sculpture through equations. Yet scientific and artistic creation do sometimes look remarkably alike. Richard Feynman once remarked that the only equipment a theoretical physicist needs is a stack of paper, a pencil and a waste-paper basket, and some artists, when they are at work, closely resemble that picture. Before the invention of the typewriter, novelists used exactly the same equipment.