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"Generally, the human race avoids doing anything radical until forced into it."
- Frederik Pohl

Maximum-security Booth  
  A special phone booth for receiving high-security, scrambled telephone calls, calls which included 3D visuals.  

I soon saw why the call had not been brought to the table; No. 12 was a maximum-security booth, sight, sound, and scramble. The tank showed no image and did not clear even after the door locked behind me. It remained milky until I sat down and placed my face within pickup, then the opalescent clouds melted away and I found myself looking at my spaceman friend.
From Double Star, by Robert Heinlein.
Published by Doubleday in 1956
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