Harmony, however, is not to be confused with free ideal subjectivity and soul-life. In the latter the unity manifested is not merely an interconnection and concordance, but a positive negation of difference, which, for the first time, reveals their concrete and ideal unity. A concrete unity such as this is not the result of harmony. Such concrete unity is, for example, that which we find in the actually melodious thing[255], which no doubt possesses harmony as its fundamental form, but at the same time possesses the higher characteristic of free subjectivity, and by means of song gives expression to that. Harmony alone has nothing to do with the appearance of subjective life, as such, nor of that of mind, although it is the highest manifestation of abstract form, and stands in close affinity to free subjectivity. Such, then, is our determination of abstract unity as we find it brought before us in the specific modes of abstract form. 2. BEAUTY AS ABSTRACT UNITY OF THE MATERIAL MEDIUM The side of abstract unity which we have now to consider is not that directly related to form, but to the sensuous material simply in which it is asserted. The unity is manifested on this side as the entirely undifferentiated concordance of the particular sensuous material. It is the one form of unity, which the material of sense, in its purely objective aspect, is capable of receiving. On this plane and under the above noted relation[256] the abstract _purity_ of the _materia_ in its form, colour, or tone constitutes what is most essential to it. Entirely straight drawn lines, which run without a shadow of difference in their straightness or strength, bare superficies and similar examples please us by virtue of their persistent regularity and their uniform homogeneousness. The purity of the heavens, the translucence of the atmosphere, a mirror-like lake the smoothness of the ocean's face, all give pleasure by virtue of this unity. We find the same truth brought home to us by purity of tone. The voice when purely produced, though taken quite by itself, possesses an attraction for us inexpressibly delightful; vocal notes which are not thus pure on the contrary, by permitting us to hear the organ of production along with them, disturb or weaken the pure resonance and definition of their music. In much the same way human speech possesses pure tones in its vowels, a, e, i, o, u, and its compound vowels, ae, ü, and ö. Popular dialects are particularly characterized by impurity of vocalization and mediate tones such as oa. Purity of tones consists further in this that the vowels are associated with consonants, whose sound does not tend to blurr the sonority of the vowel tones, as is too frequently the case with our northern languages, when contrasted with the way in which their purity is preserved by the Italian, a characteristic which makes that language so adaptable to singing. We experience an enjoyment of