Therefore a perfectly accurate system of music cannot even be thought, far less worked out; and on this account all possible music deviates from perfect purity; it can only conceal the discords essential to it by dividing them among all the notes, _i.e._, by temperament. On this see Chladni’s “Akustik,” § 30, and his “Kurze Uebersicht der Schall- und Klanglehre.”(63) I might still have something to say about the way in which music is perceived, namely, in and through time alone, with absolute exclusion of space, and also apart from the influence of the knowledge of causality, thus without understanding; for the tones make the æsthetic impression as effect, and without obliging us to go back to their causes, as in the case of perception. I do not wish, however, to lengthen this discussion, as I have perhaps already gone too much into detail with regard to some things in this Third Book, or have dwelt too much on particulars. But my aim made it necessary, and it will be the less disapproved if the importance and high worth of art, which is seldom sufficiently recognised, be kept in mind. For if, according to our view, the whole visible world is just the objectification, the mirror, of the will, conducting it to knowledge of itself, and, indeed, as we shall soon see, to the possibility of its deliverance; and if, at the same time, the world as idea, if we regard it in isolation, and, freeing ourselves from all volition, allow it alone to take possession of our consciousness, is the most joy-giving and the only innocent side of life; we must regard art as the higher ascent, the more complete development of all this, for it achieves essentially just what is achieved by the visible world itself, only with greater concentration, more perfectly, with intention and intelligence, and therefore may be called, in the full significance of the word, the flower of life. If the whole world as idea is only the visibility of will, the work of art is to render this visibility more distinct. It is the _camera obscura_ which shows the objects more purely, and enables us to survey them and comprehend them better. It is the play within the play, the stage upon the stage in “Hamlet.”