@oantolin Emacs predates Lisp Machines. Emacs is an editor, nothing more or less. It is not a Lisp environment, or a Lisp implementation.
And yes, it is about Lisp, an extensible language. Emacs is special, but it is for other reasons.
#GNU #Emacs is a far shot from #LispM #LispMachine, and ZWEI is a far shot from #GNU #Emacs.