A second characteristic distinguishing aesthetic expressions from other expressions is their superior unity. In the latter, the unity lies in the purpose to be attained or in the content of the thought expressed; it is teleological or logical. The unity of a chair is its purpose, which demands just such parts and in just such a mechanical arrangement; the unity of a business conversation is governed by the bargain to be closed, requiring such words and such only, and in the appropriate logical and grammatical order. The unity of an argument is the thesis to be proved; the unity of a diagram is the principle to be illustrated or the information to be imparted. Compare the unity of a sonnet or a painting. In a sonnet, there is a unity of thought and sentiment creating a fitting grammatical unity in language, but in addition a highly elaborate pattern in the words themselves that is neither grammatical nor logical. In a painting, besides the dramatic unity of the action portrayed, as in a battle scene; or of the spatial and mechanical togetherness of things, as in a landscape; there is a harmony of the colors, a composition of the lines and masses themselves, not to be found in nature. And, although the general shape and arrangement of the parts of a useful object is dominated by its purpose, if it is also beautiful--a Louis Seize chair, for example--there is, besides, a design that cannot be explained by use. In artistic expressions, therefore, there exists a unity in the material, superposed upon the unity required by the purpose or thought expressed. And this property follows from the preceding. For, since the medium is valuable in itself, the mind, which craves unity everywhere, craves it there also, and lingers longer and more happily on finding it; and, since the medium can be expressive, the unity of the fundamental mood of the thought expressed will overflow into and pervade it. Hence there occurs an autonomous development of unity in the material, raising the total unity of the expression to a higher power. CHAPTER III THE INTRINSIC VALUE OF ART