Kenyon, Kay -- Bright of the Sky

Beginning of a series set alternately in a future Galactic civilization and an artificial universe/habitat -- the Biggest of all Dumb Objects. Random human fell into the Bright during a wee hyperdrive accident, spent years there, and then somehow returned. His convenient amnesia gives the author a book's worth a plot which is completely unengaging; rather than an introduction to the Bright, it feels like reading the Cliff's Notes(*) stretched out over hundreds of pages. Also, everyone there is culturally required to be a jerk.

(* Note for modern reader: Wikipedia entry.)

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