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"SF looks towards an imaginary future, while fantasy, by and large, looks towards an imaginary past."
- Frederik Pohl

Jumpdoor  
  The entrance to an energy passage providing instantaneous transportation between points across the galaxy.  

How might it be possible to move from one place to another, without traversing the space in between? Frank Herbert takes a shot at it in Whipping Star:

The jumpdoor began to hum with its aura of terrifying energies. The door's vortal tube snapped open. McKie tensed himself for the syrupy resistance to jumpdoor passage, stepped through the tube. It was like swimming in air became molasses - perfectly normal-appearing air. But molasses.

McKie found himself in a rather ordinary office..

From Whipping Star, by Frank Herbert.
Published by Galaxy Publishing in 1969
Additional resources -

Jumpdoors can be dangerous; just make sure you're all the way through when they close.

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Additional resources:
  More Ideas and Technology from Whipping Star
  More Ideas and Technology by Frank Herbert
  Tech news articles related to Whipping Star
  Tech news articles related to works by Frank Herbert

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