These situations of tragic significance introduce a peculiar difficulty in dealing with them which is inherent in their very conception. For inasmuch as they obviously arise from violations of the world-condition they offer to our consideration circumstances which are unable to continue as they are, which render necessary something of a remedial nature to reclothe them. But the beauty of the Ideal consists precisely in its undisturbed unity, repose, and consummation with itself. The collision, on the other hand, disturbs this harmony of what is truly real and ethical, and drives this unity of the Ideal into discord and opposition. Through the representation of such disruption the Ideal itself suffers violation. The function of art will undoubtedly consist partly in preventing the entire destruction of free beauty in this difference, and partly in only carrying this breach of unity and the conflict it occasions to a point in which harmony may again be recovered as the result of such a conflict and its resolution, and in this way become manifest for the first time in its essential perfection. It is, however, impossible to determine on a general principle the precise limit to which such discordance may be carried inasmuch as the several arts in this respect preserve their independent character. The medium of the subjective idea can support a far intenser disruption than that of the plastic arts[318]. In other words, poetry is quite within its right when it breaks up the unity of the world of the imagination even to the point of the extremest form of desperation, and in its delineation of external objects to that of absolute ugliness. In the case of the plastic arts, on the contrary, in painting, that is to say, and even more so in sculpture, the external form remains in unalterable fixity; it can neither be removed nor lightly passed over in such a way that it again disappears. Under such conditions it would be a serious defect to represent once and for all an ugliness, which could not possibly be transmuted. Consequently all that would be quite compatible in dramatic poetry, which is able to represent a momentary appearance that again vanishes, is not within the province of the plastic arts. In discussing the more obvious types of collision we can only in this portion of our inquiry indicate the most general points of view. We would particularly draw attention to three fundamental aspects under which they may be co-ordinated. _First_, there are those collisions which proceed from purely _natural_, that is to say, physical conditions, in so far as these are characterized with qualities which are negative or evil and consequently discordant. _Secondly_, we have collisions which are of a _spiritual_ nature, but which depend on _natural_ conditions, conditions which may in themselves have a positive[319] character yet for the spirit contain within themselves the seeds of difference and contradiction.