The first occurred in the fifth century B.C., when Athens underwent a change from an oral culture to an alphabet-writing culture. To understand what this meant, we must read Plato. The second occurred in the sixteenth century, when Europe underwent a radical transformation as a result of the printing press. To understand what this meant, we must read John Locke. The third is happening now, in America, as a result of the electronic revolution, particularly the invention of television. To understand what this means, we must read Marshall McLuhan.
