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Bigger Than Worlds is a subgenre well-described by its name. Vast artificial megastructures are the setting for these stories; almost characters in themselves. Olaf Stapledon's 1937 novel Star Maker is probably the first such tale, with a star-englobing construct of a type later known as a Dyson Sphere. Larry Niven's 1970 novel Ringworld introduced that carefully thought-out habitable structure. This subgenre's largest imagined construct (at tens of millions of light years across) is perhaps Bolder's Ring, found in Stephen Baxter's "Xeelee" novels.
