Cities in Flight by James Blish:
Science Fiction Inventions and Ideas

Cities in Flight is really four separate novels; They Shall Have Stars (1957), A Life for the Stars (1962), Earthman Come Home (1955) and The Triumph of Time (1958). The period of time spanned by these four novels adds up to many hundreds of years. The books all derive their plot from a single great idea - the spindizzy, a gravity polarizer that allows entire cities to break free of the Earth and leave for the stars. This is a great science-fiction novel; it has wonderful inventions, well-written characters, and remarkable political sophistication. Select an invention:

Accelerated Schooling

Accelerated Schooling Helmet

Anti-agathic drugs

Battle Tank Display

City Fathers - AI with centuries of experience

Dirac Transmitter (also Tranceiver or Communicator) - instant communication

Eavesdropper - check if it's safe

Inter-Universal Messenger

Machine Psychologist

Proselytizing Robot

Space Armor

Spindizzy - pick up your town and go

Teleoperated Lab Robot

Tin Cabby (Tin Cabbie) - mechacab

Toposcope

 

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