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Other works

Lewis wrote several works on Heaven and Hell. One of these, The Great Divorce, is a short novella in which a few residents of Hell take a bus ride to Heaven, where they are met by people who dwell there. The proposition is that they can stay if they choose, in which case they can call the place where they had come from " Purgatory ", instead of "Hell", but many find it not to their taste. The title is a reference to William Blake 's The Marriage of Heaven and Hell, a concept that Lewis found a "disastrous error". This work deliberately echoes two other more famous works with a similar theme: the Divine Comedy of Dante Alighieri, and Bunyan's The Pilgrim's Progress.

Another short work, The Screwtape Letters, which he dedicated to J. R. R. Tolkien, consists of letters of advice from senior demon Screwtape to his nephew Wormwood on the best ways to tempt a particular human and secure his damnation. Lewis's last novel was Till We Have Faces, which he thought of as his most mature and masterly work of fiction but which was never a popular success. It is a retelling of the myth of Cupid and Psyche from the unusual perspective of Psyche's sister. It is deeply concerned with religious ideas, but the setting is entirely pagan, and the connections with specific Christian beliefs are left implicit.

Before Lewis's conversion to Christianity, he published two books: Spirits in Bondage, a collection of poems, and Dymer, a single narrative poem. Both were published under the pen name Clive Hamilton. Other narrative poems have since been published posthumously, including Launcelot, The Nameless Isle, and The Queen of Drum.

He also wrote The Four Loves, which rhetorically explains four categories of love: friendship, eros, affection, and charity.

In 2009, a partial draft was discovered of Language and Human Nature, which Lewis had begun co-writing with J. R. R. Tolkien, but which was never completed.

In 2024 an original poem was discovered in a collection of documents in Special Collections at the University of Leeds. Its Old English title, "Mód Þrýþe Ne Wæg", is not easily translated into modern English and references the epic poem Beowulf. The poem was addressed to professor of English Eric Valentine Gordon and his wife Dr Ida Gordon. It was written under the pen name Nat Whilk, meaning "someone" in Old English.