A theory of cultural change is impossible without knowledge of the changing sense ratios effected by various externalizations of our senses. (p. 49) - Marshall McLuhan

Typography tended to alter language from a means of perception and exploration to a portable commodity. (p. 183)

In television, images are projected at you. You are the screen. The images wrap around you. You are the vanishing point. (p. 125)

"Oddly enough, it is a consumer-oriented culture that is concerned about authors and labels of authenticity. Manuscript culture was producer-ori-ented, almost entirely a do-it-yourself culture, and naturally looked to the relevance and usability of items rather than their sources. Not only was private authorship in the later print meanings unknown, but there was no reading public in our sense, either. This is a matter that has usually been confused with ideas about "the extent of literacy." But even if literacy were universal, under manuscript conditions an author would still have no public. An advanced scientist today has no public. He has a few friends and colleagues with whom he talks about his work. What we need to have in mind is that the manuscript book was slow to read and slow to move or be circulated."