Environments are not passive wrappings, but are, rather, active processes which are invisible. The groundrules, pervasive structure, and over-all pat… - Marshall McLuhan

Environments are invisible. Their groundrules, pervasive structure, and overall patterns elude easy perception.

Typical of the reversing that occurs at break boundaries is the paradox that nomadic mobile man, the hunter and food-gatherer, is socially static. On the other hand, sedentary, specialist man is dynamic, explosive, progressive. The new magnetic or world city will be static and iconic or inclusive.

The electric light is pure information. It is a medium without a message. (p. 8)

There are no passengers on Spaceship Earth. We are all crew.