The book C.S. Lewis called "the greatest work of imaginative fiction of the twentieth century" sold 600 copies in the author's lifetime. Can you guess what it is? Most people who care about fantasy have never read *A Voyage to Arcturus* by David Lindsay. This is a genuine gap in the canon. Lewis didn't just praise it, he said it was the direct inspiration for his Space Trilogy, and that it showed him imaginative fiction could carry real spiritual and philosophical weight. Tolkien was most certainly influenced by it. But when it was published in 1920 it sold so poorly that Lindsay spent the rest of his life in poverty, writing books almost no one bought, dying in obscurity in 1945. In the novel a man named Maskull travels to the planet Tormance, a world orbiting Arcturus, where he visits a series of landscapes that are less like science fiction settings and more like states of consciousness.…