Romantic visual and literary artists glorified things which takes us to problem number two: the "things" they glorified were hardly ever physical.
They glorified huge, complex concepts such as liberty, survival, ideals, hope, awe, heroism, despair, and the various sensations that nature evokes in humans.
All of these are felt -- and felt on an individual, highly subjective level.
Hope that helped!! :)
Franz Joseph Haydn
A composer from Vienna, Austria who developed new musical forms such as the sonata and the symphony during the classical period
It would be the lines of shading and the lines of distance :-)
A low pitch will have a low frequency