Edgar Allan Poe once wrote an essay called “The Philosophy of Composition,” to explain why he wrote “The Raven” backward. The poem tells the story of a man who, “once upon a midnight dreary,” while mourning his dead love, Lenore, answers a tapping at his chamber door, to find “darkness there and nothing more.” He peers into the darkness, “dreaming dreams no mortal ever dared to dream before,” and meets a silence broken only by his whispered word, “Lenore?” He closes the door. The tapping starts again. He flings open his shutter and, “with many a flirt and flutter,” in flies a raven, “grim, ungainly, ghastly, gaunt, and ominous bird of yore.” The bird speaks just one word: “Nevermore.” That word is the poem’s last, but it’s where Poe began. He started, he said, “at the end, where all works of art should begin,” and he “first put pen to paper” at what became the third-to-last stanza: “Prophet,” said I, “thing of evil! prophet still if bird or devil! By that heaven that bends above u...