We all know what the past looks like. Go back a hundred years, and the world was black and white, sped up and weirdly jerky. People talked in ornate title cards – which was lucky, because how else could you hold a conversation over the din of a dramatic piano score? Philip Larkin once wrote that sexual intercourse began in 1963; it seems that sound and colour began before that, but not by all that much, compared to the history of the world. It is strange to think that two entire world wars were fought entirely in monochrome.