4. The third part of our subject, in contradistinction to the two just described, presupposes the conception of the Ideal, and the general types of art, inasmuch as it simply consists of their realization in particular sensuous media. Hence we have no longer to do with the inner development of artistic beauty in conformity with its general fundamental principles. What we have to study is how these principles pass into actual existence, how they distinguish themselves in their external aspect, and how they give actuality to every element contained in the idea of beauty, separately and by itself _as a work of art_, and not merely as a general type. Now, what art transfers into external existence are the differences[161] proper to the idea of beauty and immanent therein. Therefore, the general types of art must reveal themselves in this third part, as before, in the character of the fundamental principle that determines the arrangement and definition of the _several arts_; in other words, the species of art contain in themselves the same essential modifications as those with which we become acquainted as the general types of art. External objectivity, however, to which these forms are introduced through the medium of a sensuous and therefore _particular_ material, affects these types in the way of making them _separate_ into independent and so particular forms embodying their realization. For each type finds its definite character in some one definite external material, and its adequate actuality in the mode of portrayal which that prescribes. But, moreover, these types of art, being for all their determinateness, its _universal_ forms, break the bounds of _particular_ realization by a determinate form of art, and achieve existence in other arts as well, although in subordinate fashion. Therefore, the particular arts belong each of them specifically to _one_ of the general types of art, and constitute _its adequate_ external actuality; and also they represent, each of them after its own mode of external plasticity, the totality of the types of art.[162]