This is an overview of legendary Lisp keyboards. If you know of any more, please add to the list. I have a couple myself (including the prototype below) but not the first two (I would give a $250 bounty for the golden tip, excluding the keyboard itself!) EDIT: I now have some Space Cadet guts! The Space-cadet keyboard From Wikipedia: The space-cadet keyboard is a keyboard used on MIT Lisp machines