this wikipedia article is awesome
"Animal bodies tend to contain specialized holes which serve various biological functions,"
"The formation of holes is a significant event in the development of an animal"
"Holes have also been described as "ontologically parasitic" because they can only exist as aspects of another object.[12] The psychological concept of a hole as a physical object is taken to its logical extreme in the fictional concept of a portable hole"
I have a weak intuition that most concepts might be usefully approached this way.
Anyone have good examples of concepts that are "ontologically fundamental" for contrast?
I've been told that there's a hole in the bottom of the sea. And that there's a flea on the speck on the frog on the bump on the branch on the log in the hole in the bottom of the sea. I've never seen it myself, but I know that it's true.