“A liberal education today must include reflection on the significance of writing and print, situating these media and all their works in their historically patterned sequences. When we speak of a sequence of media, we do not mean that new media of communications annihilate their antecedents. When men learned to write, they continued to talk. When they learned letterpress printing, they continued both to talk and write: Since they have invented radio and television, they have continued to talk and write and print. But the advent of newer media alters the meaning and relevance of the older. Media overlap, or, as Marshall McLuhan has put it, move through one another as do galaxies of stars, each maintaining its own basic integrity but also bearing the marks of the encounter ever after.”