More closely regarded, then, the specific types of art have their origin, as the unfolded realization of the Idea of the beautiful, in the very nature of the Idea itself, which by means of them presses forward to real and concrete appearance. Moreover, just in so far as it ceases to expand[2] in the abstract determination or concrete fulness of any one of them, it manifests itself in some other form of realized expression. For the Idea is only Idea in its essential truth in so far as it proceeds in this self-evolution by means of its own activity. And inasmuch as it is, as Ideal, immediate appearance, and moreover with each mode thereof is still identical as the idea of the beautiful, we find that in every particular phase which reveals the Ideal in its process of self-explication we have another actual manifestation which is immediately related to the essential characterization of those diverse types of yet further expansion. It really is a matter of no consequence whether we regard this process as a process of the Idea within its own substance, or that of the form under which it attains determinate existence, inasmuch as both aspects are immediately bound up with each other, and the perfecting of the Idea as content, and the perfecting of its form are but two ways of expressing the same process. Or, to put the matter in the reverse way, the defects of a given form of art of this kind betray themselves as a defect of the Idea, in so far as such defects give a limited significance to the essential nature of the Idea in external form, and as such invest it with reality. When we consequently compare such still inadequate forms of art with what most obviously presents itself for comparison, that is, the true Ideal, we must be careful not to use expressions commonly applicable to works of art that are failures, which either express nothing at all, or have discovered an incompetence to express what ought to have been expressed. Rather for every form of the Idea there is a definite mode of appearance, which clothes it precisely in one of those particular forms of art to which we have adverted, adequate in every respect thereto, and the defective or perfected character of which consists entirely in the relative truth or untruth of the determinate form, under which and through which the Idea is actually realized. For the content must first be clothed with reality and concreteness before it can attain to the form wholly adequate to its essential truth. As we have already indicated in the previous division of our subject-matter, we have three fundamental forms or types of art to examine.