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“Sub-creation” is a category for books that foreground the imaginative making of a secondary world—coherent geographies, histories, cultures, languages, and metaphysics—so fully realized that exploring the world is as central as following the plot. Drawing on Tolkien’s idea of humans as “sub-creators,” these works treat world-building as the primary artistic act, often supported by myths, maps, lore, and appendices, and sometimes by meta-stories about gods, artists, or engineers who create or sustain worlds within the narrative. Spanning fantasy, science fiction, and mythic or literary fiction, the hallmark is an internally consistent cosmos whose rules shape the characters’ choices and the story’s stakes. The appeal lies in immersion and “secondary belief,” inviting readers to inhabit a crafted reality with mythopoeic depth rather than simply observe a backdrop.

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