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"You have to budget the number of fuzzy rules you use to control a system. It turns out, you can state the optimality principle in three words: 'patch the bumps.'"
- Bart Kosko

Floating Castle  
  A vast building floating freely above the land surface of Ringworld.  

They circled it in the dark, like curious minnows nosing a sinking beer bottle. It was a ten-story castle floating a thousand feet high, and it was all lit up like the instrument board on some ancient rocket ship...

There was no way to land the castle. Who had built it, and how, with no bottom to it? Concrete and metal, asymmetrically designed, and what the tanj was holding it up?

From Ringworld, by Larry Niven.
Published by Ballantine in 1970
Additional resources -

Compare to the floating buildings from Philip K. Dick's 1974 novel Flow My Tears, The Policeman Said.

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