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"In 1970 I found little difficulty staying 30 years ahead of the man in the street, and now I find it difficult to stay 18 months ahead of the man on the street."
- Vernor Vinge

One-Way Passage  
  A different way to assure permanent egress.  

Two of the Szecr, the elite police, met him at the exit hatch, escorted him down the gangway like a prisoner, ushered him into a peculiar one-way passage. Flexible spines grew from the walls in the direction of passage; a man could enter the hall, but could not change his mind and return. The end of the passage was closed by a sheet of clear glass; at this point, Farr could move neither forward nor back.
From The Houses of Iszm, by Jack Vance.
Published by Better Publications in 1954
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