But supposing the first interpretation correct: supposing space-unity, conditioned by the unified and reposeful act of seeing, to be the beauty we seek--it is at once clear that the reduction of three dimensions to two does not constitute unity even for the eye alone; how much less for the motor system of the whole body, which we have seen must be involved. Hildebrand's "demands of the eye" resolves itself into the stimulation plus repose of the ciliary muscle,--the organ of accommodation. A real unity even for the eye alone would have to include not only space relations in the third dimension, but relations of line and mass and color in the flat. As for the "complete sensuous experience of the spatial" (which would seem to be equivalent to Berenson's "tactile values"), the "clearness" of Hildebrand's sentence above quoted, it is evident that completeness of the experience does not necessarily involve the positive or pleasurable toning of the experience. The distinction is that between a beautiful and a completely realistic picture. A further extension or restatement of this theory, in a recent article,<1> seems to me to express it in the most favorable way. Beauty is again connected with the functioning of our organs of perception (Auffassungorgane). "We wish to be put into a fresh, lively, energetic and yet at the same time effortless activity.... The pleasure in form is a pleasure in this, that the conformation of the object makes possible or rather compels a natural purposeful functioning of our apprehending organs." But purposeful for what? For visual form, evidently to the end of seeing clearly. The element of repose, of unity, hinted at in the "effortless" of the first sentence, disappears in the second. The organs of apprehension are evidently limited to the eye alone. It is not the perfect moment of stimulation and repose for the whole organism which is aimed at, but the complete sensuous experience of the spatial, again. <1> Th. A. Meyer, "Das Formprinzip des Schouen," _Archiv. f. Phil._, Bd. x. Hildebrand, to return to the more famous theorist, was writing primarily of sculpture, and would naturally confine himself to consideration of the plastic, which is an additional reason against making this interesting brochure, as some have done, the foundation of an aesthetics. It is rather the foundation of the sculptor's, perhaps even of the painter's technique, with reference to plastic elements alone. What it contains of universal significance, the demand for space-unity, based on the state of the eye in a union of rest and action, ignores all but one of the possible sources of rest and action for the eye, that of accommodation, and all the allied activities completely.