Does the interiorization of media such as letters alter the ratio among our senses and change mental processes? (p. 28) - Marshall McLuhan

One of the many effects of television on radio has been to shift radio from an entertainment medium into a kind of nervous information system. (p. 298)

Poetry and the arts can’t exist in America. Mere exposure to the arts does nothing for a mentality which is incorrigibly dialectical. The vital tensions and nutritive action of ideogram remain inaccessible to this state of mind.

The present is always invisible because it's environmental. No environment is perceptible, simply because it saturates the whole field of attention.