I think (s)he's saying that human languages have composable, tree-like structures. There's nothing Lisp-specific about that, though. Prolog would work just as w

I think (s)he's saying that human languages have composable, tree-like structures. There's nothing Lisp-specific about that, though. Prolog would work just as well, or ML (human languages may be statically typed), Joy, etc. Also, I'm an amateur linguist at best, but the recursive structures in human languages generally don't get more than a couple levels deep - the linguistic stack seems to get smashed pretty easily.