Bounded vs Centered Sets
In recent years I've come across an interesting distinction that I keep having to explain to people. To make it easier I am writing it up in a single place for reference.
Specifically, there's two different ways that humans can conceptualize a definition or category: Bounded sets and Centered sets. It seems to be a discussion that's all the rage in religious circles, but I first ran across it in an entirely secular context in the IT field.