We must keep in mind the story of the statistician who drowned while trying to wade across a river with an average depth of four feet. - Neil Postman

Childhood is analogous to language learning. It has a biological basis but cannot be realized unless a social environment triggers and nurtures it, that is, has need of it. If a culture is dominated by a medium that requires the segregation of the young in order that they learn unnatural, specialized, and complex skills and attitudes, then childhood, in one form or another, will emerge, articulate and indispensable.

Alfred North Whitehead summed it up best when he remarked that the greatest invention of the nineteenth century was the idea of invention itself. We had learned how to invent things, and the question of why we invent things receded in importance. The idea that if something could be done it should be done was born in the nineteenth century. And along with it, there developed a profound belief in all the principles through which invention succeeds: objectivity, efficiency, expertise, standardization, measurement, and progress. It also came to be believed that the engine of technological progress worked most efficiently when people are conceived of not as children of God or even as citizens but as consumers — that is to say, as markets.

Technological change is neither additive nor subtractive. It is ecological. I mean “ecological” in the same sense as the word is used by environmental scientists. One significant change generates total change. If you remove the caterpillars from a given habitat, you are not left with the same environment minus caterpillars: you have a new environment, and you have reconstituted the conditions of survival; the same is true if you add caterpillars to an environment that has had none. This is how the ecology of media works as well. A new technology does not add or subtract something. It changes everything.