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"Universe creation" is a speculative fiction category in which the act of making a world—or worlds—is the central conceit: protagonists may be gods, scientists, programmers, artists, or authors who forge, code, seed, or narrate entire realities, and the plot revolves around the mechanics, consequences and ethics of that creation. These books explore how laws, life and meaning emerge, the relationship between creator and created, and questions of responsibility, identity and free will; they range in tone from wonder and awe to hubris and horror and can read like cosmic fantasy, hard science fiction, simulation fiction or metafiction. Tropes include worldbuilding as experiment or art, pocket or simulated universes, emergent civilizations, creator/creation conflict, and universe-scale tinkering, and the category appeals to readers who like grand conceptual ideas, intricate systems, and philosophical stakes on an epic scale.

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