Filth and the flesh are their all in all.

They deny wonder and reject the extra-sensual.

I don't believe they would know what you meant if you told them that artistic curiosity begins at the very point where the senses leave off.
"You shrug your shoulders, but tell me, how much has naturalism done to clear up life's really troublesome mysteries?
When an ulcer of the soul--or indeed the most benign little pimple--is to be probed, naturalism can do nothing.

'Appetite and instinct' seem to be its sole motivation and rut and brainstorm its chronic states.

The field of naturalism is the region below the umbilicus.