[jimbokun]

"And what about CLOS? Does not make Lisp, in your words, a "hash programming language"?"

I think in the "hash" languages, you usually consider the method to "belong" to an object in some way.

With multi-method dispatch, the relationship between objects and methods is more fluid. So I think there is a difference here, too.

It's not that "list" languages only use tree structures for everything, just that trees are the more "natural" choice in those languages.