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"Science fiction and science have always danced around each other. Science fiction is the subconscious of science."
- Greg Bear

Floating Spherical Pool  
  Control of gravity permits mid-air pools of water.  

You may recall the following scene from Star Wars Episode Three: Revenge of the Sith:

Now read what Jack Williamson wrote three generations ago.

The pursuit followed his voice. But Chan’s plunging flight had already carried him into the “hanging pools” that were one of the New Moon’s novel attractions—great spheres of water, each held aloft by a gravity-plate core of its own, each illuminated with colored light that turned it to a globe of changing fire.

The swimmers had fled. Chan threaded a swift way among the spheres. He heard an alarm siren moaning behind him. And suddenly the gravity-circuits must have been cut off, for the shimmering spheres of water turned to plunging falls.

From One Against The Legion, by Jack Williamson.
Published by Astounding in 1939
Additional resources -

It's all there in the works of the Golden Age greats.

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