I think it would be the aspect of realism
Answer:
Art inspired books, jewelry and other gifts.
Explanation:
First off this should this question be in Biology.... and the answer this question is weight, height, level of activity and hormone imbalances.
Answer: Freedom of form and design, song-like melodies (as well as many chromatic harmonies and discords), dramatic contrasts of dynamics/pitch, and big orchestras (due mainly to brass and the invention of the valve).
