Foot odor (or foot odour) is a type of body odor that affects the feet of humans and is generally considered to be an unpleasant smell.
https://en.wikipedia.org/wiki/Foot_odor
Concept art Smelly feet Bad knees
"I wanted very much to learn to draw, for a reason that I kept to myself: I wanted to convey an emotion I have about the beauty of the world."
Robot Leg Concept
Concept art Smelly feet Bad knees