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"Everything starts as somebody's daydream. And, when you're daydreaming, it is science fiction. It's when you start work out how you put it together, true science fiction becomes real science."
- Larry Niven

Pocket Universe  
  A created, separate space within the normal space of the universe.  

A unique, early use of this term and idea.

He'd evidently put aside the small contrivance I'd last seen him working on, and he'd made a gadget—a diamagnet or whatever it ought to be called—a thing that closed space around itself in a pocket universe when it was turned on—that was extendible.
From Pocket Universes, by Murray Leinster.
Published by Thrilling Wonder Stories in 1946
Additional resources -

This term was used in a spiritual sense in the late nineteenth century.

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Additional resources:
  More Ideas and Technology from Pocket Universes
  More Ideas and Technology by Murray Leinster
  Tech news articles related to Pocket Universes
  Tech news articles related to works by Murray Leinster

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