“When machinery functions perfectly it ceases to be there-but so do we. Radios and films allow us to be where we are not and not be where we are. Moreover, machinery is veiling. It is a way of hiding our inaction from ourselves under what appear to be actions of great effectiveness. We persuade ourselves that, comfortably seated behind the wheels of our autos, shielded from every unpleasant change of weather, and raising or lowering our foot an inch or two, we have actually traveled somewhere.”