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"Conspiracy theories are big because they're comforting. Any conspiracy is infinitely less multiplex than the real deal, which is multiplex to the point of being unknowable."
- William Gibson

Displacement Booth  
  A teleportation portal.  

The displacement booths were the sole and ubiquitous form of travel in the future society of the novel.

A displacement booth was a glass cylinder with a rounded top. The machinery that made the magic work was invisible, buried beneath the booth. Coin slots and a telephone dial were set into the glass at sternum level.

Jerryberry inserted his CBA credit card below the coin slots. He dialled by punching numbered buttons. Withdrawing the credit card closed a circuit. An eyeblink later he was in an office in the Central Broadcasting Association building in Downtown Los Angeles.

From Flash Crowd, by Larry Niven.
Published by Fantasy And Science Fiction in 1972
Additional resources -

Displacement booths are similar to the more technologically advanced stepping discs created by the alien Puppeteers of Niven's 1970 novel Ringworld.

In Flash Crowd, Niven explores the idea more thoroughly than in Ringworld. He adds additional material about how stepping discs are used by Puppeteers in his new book Fleet of Worlds, written with Edward M. Lerner.

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Additional resources:
  More Ideas and Technology from Flash Crowd
  More Ideas and Technology by Larry Niven
  Tech news articles related to Flash Crowd
  Tech news articles related to works by Larry Niven

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