The method of invention, as Edgar Poe demonstrated in his “Philosophy of Composition,” is simply to begin with the solution of the problem or with the effect intended. Then one backtracks, step by step, to the point from which one must begin in order to reach the solution or effect. Such is the method of the detective story, of the symbolist poem, and of modern science. It is, however, the twentieth century step beyond this method of invention which is needed for understanding the origin and the action of such forms as the wheel or the alphabet. And that step is not the backtracking from product to starting point, but the following of process in isolation from product. To follow the contours of process as in psychoanalysis provides the only means of avoiding the product of process, namely neurosis or psychosis. It is the purpose of the present book to study primarily