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What is peculiar about such interpositions of media is that their role in directing what we will see or know is so rarely noticed. A person who reads a book or who watches television or who glances at his watch is not usually interested in how his mind is organized and controlled by these events, still less in what idea of the world is suggested by a book, television, or a watch. But there are men and women who have noticed these things, especially in our own times. Lewis Mumford, for example, has been one of our great noticers. He is not the sort of a man who looks at a clock merely to see what time it is. Not that he lacks interest in the content of clocks, which is of concern to everyone from moment to moment, but he is far more interested in how a clock creates the idea of "moment to moment." He attends to the philosophy of clocks, to clocks as metaphor, about which our education has had little to say and clock makers nothing at all. "the clock," Mumford has concluded, "is a piece of power machinery whose 'product' is seconds and minutes." In manufacturing such a product, the clock has the effect of disassociating time from human events and thus nourishes the belief in an independent world of mathematically measurable sequences. Moment to moment, it turns out, is not God's conception, or nature's. It is man conversing with himself about and through a piece of machinery he created. In Mumford's great book Technics and Civilization, he shows how, beginning in the fourteenth century, the clock made us into time-keepers, and then time-savers, and now time-servers. In the process, we have learned irreverence toward the sun and the seasons, for in a world made up of seconds and minutes, the authority of nature is superseded. Indeed, as Mumford points out, with the invention of the clock, Eternity ceased to serve as the measure and focus of human events. And thus, though few would have imagined the connection, the inexorable ticking of the clock may have had more to do with the weakening of God's supremacy than all the treatises produced by the philosophers of the Enlightenment; that is to' say, the clock introduced a new form of conversation between man and God, in which God appears to have been the loser. Perhaps Moses should have included another Commandment: Thou shalt not make mechanical representations of time.
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Neil Postman (Amusing Ourselves to Death: Public Discourse in the Age of Show Business)