All structures in our universe are trees^. Numbers are a metalanguage for describing those trees. It is possible that there are other independent universes that

All structures in our universe are trees^. Numbers are a metalanguage for describing those trees. It is possible that there are other independent universes that we can't perceive, but I'd expect any aliens that we eventually interact with to be operating only in the treeverse, and so also be fluent in a language like our numbers. ^ Perhaps there are other independent universes out there that we don't perceive, but human brains are trees and all structures we can perceive and communicate about also are trees. We live in a treeverse.