On a higher plane in the sphere of abstract beauty must be placed _harmony._ In harmony we find qualitative distinctions are held together, and further held together in a totality of differentiation, such as is based on the essential nature of the fact itself. This consistency of support is derived from conformity to law, in so far as that form unfolds what is essentially uniformity, and thereby passes beyond the mere characteristics of equality and repetition. But in doing this the distinctions of quality assert themselves not only in their difference of opposition and contradiction, but in aspects of a unity that rivets them together, a unity in which all distinguishing features, it is true, are maintained in their proper place, but still only as belonging to one single whole. This unity of accordance is what constitutes harmony. We may either regard it as a totality of aspects essentially distinct, or as the resolution of the element of mere contradiction asserted by them, revealing their more vital interconnection and ideal solidarity. In this sense we refer to the harmony of form, or colour, or musical tone. As an example, we have blue, yellow, green, and red as the fundamentally necessary differentiation of colour[253]. In these irresolvable data of the spectrum we have not merely the inequality we found in symmetry, but contradictory opposites, such as yellow and blue, their neutralization and withal concrete identity. The beauty of their harmony is revealed in the avoidance of their crude opposition, which is softened thereby in such a way as to put before us the concordance hidden beneath their difference. They do, in fact, emanate from one source, namely colour, which is not an abstract conception[254], but an essential totality. So far, indeed, can the compulsive force of such totality carry us, that we can, as Goethe has pointed out, when we have but one colour presented to us, still subjectively recognize another at the same time. In the same way the tonic, mediant, and dominant are essential distinctions among musical tones, which the unity of harmony associates through their difference in one whole. We may submit the harmony of form, which is differentiated through the varied aspects of position, repose, and motion to a similar analysis. If we suffer any one of the subordinate distinctions to assume an exclusive predominance the unity which relates them will be destroyed.