"In this book I am concerned with certain kinds of communication: communication between parents and children, between associates of the same status, between members of different societies and, through the mediation of various kinds of coding—tools, art, script, formulas, film—between cultures distant from each other in time and place. I shall be concerned to show that we must deal not only with evolutionary sequences, in which our ability to articulate and codify parts of the culture enormously increases our ability to intervene in the cultural process, but also with the coexistence at any period of history of earlier forms of communication side by side with later ones."