The musician in producing his art proceeds in precisely the same way as the poet or painter. He takes natural signs and rearranges them in a new order, producing a combination which is not to be found complete in nature, but every sign therein is natural and must necessarily be so. The higher the flight of the poet, or musician, or painter, or sculptor, the farther is the result from nature, but nevertheless the whole aim of the musician, as of the poet, is to represent emotional effects or natural phenomena beyond experience in life, as the great sculptor represents form and expression, and the great poet besides these things, every abstract quality, passion, and emotional effect, above this experience; but he cannot do more; he cannot represent something outside of nature, and so must imitate, that is, in the sense of representation. Darwin notes that even a perfect musical scale can be found in nature. He says[b]: It is a remarkable fact that an ape, a species of the gibbon family, produces an exact octave of musical sounds, ascending and descending the scale by half tones. From this fact, and from the analogy of other animals, I have been led to infer that the progenitors of man probably uttered musical tones, and that consequently, when the voice is used under any strong emotion, it tends to assume, through the principle of association, a musical character. It has been further demonstrated that the strength of the sensory impressions from certain sounds is due to the structure of the ear, and that generally a particular kind of sound produces a similar kind of emotional effect in animals as in man. Obviously the musician is powerless to do more than widen or deepen this effect. Colvin admits that the musician sometimes directly imitates, as when he produces the notes of birds or the sounds of natural forces, or when he represents particular emotions; but he regards the former instances as hazardous and exceptional, and indicates that a particular emotional harmony may affect the hearers differently. True, but the hazard of the first condition is the result of the limitations of the artist, and the second condition is the consequence of the limitations of the art. The effect of music being purely sensorial must vary with the emotional conditions surrounding the hearer. The musician does what he can, but he is unable to go so far as the poet and produce an emotional effect which will with certainty be recognized by every person affected, at all times, as having the same particular bearing.