Some who hold firmly to the aesthetic character of given groups of impressions (for example, the visual, the auditive), and exclude others, admit, however, that if visual and auditive impressions enter _directly_ into the aesthetic fact, those of the other senses also enter into it, but only as _associated_. But this distinction is altogether arbitrary. Aesthetic expression is a synthesis, in which it is impossible to distinguish direct and indirect. All impressions are by it placed on a level, in so far as they are aestheticised. He who takes into himself the image of a picture or of a poem does not experience, as it were, a series of impressions as to this image, some of which have a prerogative or precedence over others. And nothing is known of what happens prior to having received it, for the distinctions made after reflexion have nothing to do with art. The theory of the aesthetic senses has also been presented in another way; that is to say, as the attempt to establish what physiological organs are necessary for the aesthetic fact. The physiological organ or apparatus is nothing but a complex of cellules, thus and thus constituted, thus and thus disposed; that is to say, it is merely physical and natural fact or concept. But expression does not recognize physiological facts. Expression has its point of departure in the impressions, and the physiological path by which these have found their way to the mind is to it altogether indifferent. One way or another amounts to the same thing: it suffices that they are impressions. It is true that the want of given organs, that is, of given complexes of cells, produces an absence of given impressions (when these are not obtained by another path by a kind of organic compensation). The man born blind cannot express or have the intuition of light. But the impressions are not conditioned solely by the organ, but also by the stimuli which operate upon the organ. Thus, he who has never had the impression of the sea will never be able to express it, in the same way as he who has never had the impression of the great world or of the political conflict will never express the one or the other. This, however, does not establish a dependence of the expressive function on the stimulus or on the organ. It is the repetition of what we know already: expression presupposes impression. Therefore, given expressions imply given impressions. Besides, every impression excludes other impressions during the moment in which it dominates; and so does every expression. [Sidenote] _Unity and indivisibility of the work of art._