Full Idea
The natural categories of individuals are arranged in a hierarchy of inclusion relations that is isomorphic with the linguistic semantic structure.
Gist of Idea
Individuals are arranged in inclusion categories that match our semantics
Source
George Engelbretsen (Trees, Terms and Truth [2005], 5)
Book Reference
'The Old New Logic', ed/tr. Oderberg,David S. [MIT 2005], p.47
A Reaction
This is the conclusion of a summary of modern Term Logic. The claim is that Sommers discerned this structure in our semantics (via the study of 'terms'), and was pleasantly surprised to find that it matched a plausible structure of natural categories.