The essence of his book is contained in the negation that it is possible to separate form and content in music. "Take any motive you will, and say where form begins and content ends. Are we to call the sounds content? Very good, but they have already received form. What are we to call form? Sounds again? But they are already form filled, that is to say, possessing a content." These observations testify to an acute penetration of the nature of art. Hanslick's belief that they were characteristics peculiar to music, not common to every form of art, alone prevented him from seeing further. C. Fiedler, published in German (in 1887) an extremely luminous work on the origin of artistic activity. He describes eloquently how the passive spectator seems to himself to grasp all reality, as the shows of life pass before him; but at the moment that he tries to realize this artistically, all disappears, and leaves him with the emptiness of his own thoughts. Yet by concentration alone do we attain to expression; art is a language that we gradually learn to speak. Artistic activity is only to be attained by limiting ourselves; it must consist of "forms precisely determined, tangible, sensibly demonstrable, precisely because it is spiritual." Art does not imitate nature, for what is nature, but that vast confusion of perceptions and representations that were referred to above? Yet in a sense art does imitate nature; it uses nature to produce values of a kind peculiar to itself. Those values are true visibility. Fiedler's views correspond with those of his predecessor, Hanslick, but are more rigorously and philosophically developed. The sculptor A. Hildebrand may be mentioned with these, as having drawn attention to the nature of art as architectonic rather than imitative, with special application to the art of sculpture. What we miss with these and with other specialists, is a broad view of art and language, as one and the same thing, the inheritance of all humanity, not of a few persons, specially endowed. H. Bergson in his book on laughter (1900) falls under the same criticism. He develops his theory of art in a manner analogous to Fiedler, and errs like him in looking upon it as something different and exceptional in respect to the language of every moment. He declares that in life the individuality of things escapes us: we see only as much as suffices for our practical ends. The influence of language aids this rude simplification: all but proper names are abstractions. Artists arise from time to time, who recover the riches hidden beneath the labels of ordinary life.