The magician's nephew

The Magician's Nephew is a prequel to the series. The middle third of the novel features creation of the Narnia world by Aslan the lion, centred on a section of a lamp-post brought by accidental observers from London in 1900. The visitors then participate in the beginning of Narnia history, 1000 years before The Lion, the Witch and the Wardrobe[a] (which inaugurated the series in 1950). The frame story is set in England and features two children ensnared in experimental travel via "the wood between the worlds". Thus, the novel shows Narnia and our middle-age world to be only two of many in a multiverse, which changes as some worlds begin and others end. It also explains the origin of foreign elements in Narnia, not only the lamp-post but also the White Witch and a human king and queen.