Based on the various tests performed, we can see that the function f(x) seems to output higher values for certain animals (tiger, lion, whale, octopus, shark), objects (chair, table), and a few emotions/abstract concepts (courage, anger). It might not be selective for a single concept, but there's a theme of animals, objects, and emotions.

[DESCRIPTION]: The function f(x) seems to be more sensitive to certain animals, objects, and emotions/abstract concepts. It outputs higher values for specific animals (tiger, lion, whale, octopus, shark), objects (chair, table), and emotions/abstract concepts (courage, anger).