IMHO, the Lisp Machine experience is completely different. Those have zero educational aspects, they were designed to write large, and stateful, applications, w

IMHO, the Lisp Machine experience is completely different. Those have zero educational aspects, they were designed to write large, and stateful, applications, where the Lisp Machine OS is the big stateful object-oriented operating system (like Symbolics Genera). Interlisp-D is even more different.