Middle-earth
Another example is C. S. Lewis's "Space Trilogy," in which Earth is also called Middle-earth. Lewis's novels are situated at the approximate time of World War II, with the last novel, "That Hideous Strength," taking place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction. Merlin, of King Arthur fame, is treated as a successor to the Atlantis magic found within "Numinor" (Lewis's unintentional misspelling of Númenor), and similarities can also be found in the Quenya name for Númenor, which is "Atalantë," and Lewis specifically references the earth as Middle-earth twice, both in Chapter 13, "They Have Pulled Down Deep Heaven on Their Heads". Lewis's borrowings came directly from Tolkien himself: they were close friends and shared each other's literary creations. Lewis encouraged Tolkien to persevere with his Middle-earth writings.A small selection from the many books about Tolkien and his created world:
British literature
A major work of science fiction, from the early 20th century, is "A Voyage to Arcturus" by Scottish writer David Lindsay, first published in 1920, and was a central influence on C. S. Lewis's "Space Trilogy".
From the early 1930s to late 1940s, an informal literary discussion group associated with the English faculty at the University of Oxford were "The Inklings". Its leading members were the major fantasy novelists; J. R. R. Tolkien and C.S. Lewis. Lewis is known for "The Screwtape Letters" (1942), "The Chronicles of Narnia" and "The Space Trilogy", while Tolkien is best known as the author of "The Hobbit" (1937), "The Lord of the Rings", and "The Silmarillion".