@amszmidt @crc I think there are some serious and interesting points to be made. What is Lisp? What is Forth?
For the former, probably something about cons cells, atoms, functions, and S-expressions. I'd like this to include Scheme but exclude Dylan. But there's an angle where Scheme is kind of like the Esperanto of Lisp; it wants to make a clean break, so in this sense it's not part of the continuous Lisp lineage.