A man's reach must exceed his grasp or what's a metaphor? (p.7) - Marshall McLuhan

The TV camera has no shutter. It does not deal with aspects or facets of objects in high resolution. It is a means of direct pick-up by the electrical groping over surfaces.

War and the fear of war have always been considered the main incentives to technological extension of our bodies. Indeed, Lewis Mumford, in his The City in History, considers the walled city itself an extension of our skins, as much as housing and clothing. More even than the preparation for war, the aftermath of invasion is a rich technological period; because the subject culture has to adjust all its sense ratios to accommodate the impact of the invading culture.

The invention of typography confirmed and extended the new visual stress of applied knowledge, providing the first uniformly repeatable “commodity,” the first assembly-line, and the first mass-production. (p. 142)