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"What has allowed so many Psychopathic Personalities to rise so high in corporations and government, is that they are so decisive. Unlike normal people, they are never filled with doubts, for the simple reason that they cannot care what happens next."
- Kurt Vonnegut, Jr.

Doorseal  
  A portable plastic seal used in temporary camps to keep moisture from escaping from dwelling places.  

The Fremen, the nomadic natives of Dune, used a wide range of devices to make their environment usable. Dune was a planet with very little moisture; no open water ran across the surface of the planet. Conserving moisture was essential to survival.

Stilgar turned away, led them down through the rocks, a twisting and turning path into a shadowed cleft that admitted them to the low entrance of a cave. Men hurried to fasten a doorseal behind them. Glowglobes showed a broad, dome-ceilinged space with a raised ledge on one side and a passage leading off from it.
From Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

Underground meeting places were used as temporary shelters; they were made livable with door seals to retain the water lost in ordinary respiration. See stillsuit to see how they did it while on the move.

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