steps soon taken by telephone, radio, and TV.

     The telephone: speech without walls.

     The phonograph: music hall without walls.

     The photograph: museum without walls.

     The electric light: space without walls.

     The movie, radio, and TV: classroom without walls.

     Man the food-gatherer reappears incongruously as 
information-gatherer. In this role, electronic man is no less a 
nomad than his Paleolithic ancestors.