Forth and lisp are very closely related — conceptually, not historically. If you wrote a lisp where evaluation went left-to-right instead of right-to-left and

Forth and lisp are very closely related — conceptually, not historically. If you wrote a lisp where evaluation went left-to-right instead of right-to-left and where the operators took fixed numbers of arguments (so you could drop the parentheses), you would have an unconventional but recognizable dialect of forth. http://en.wikipedia.org/wiki/SECD_machine http://en.wikipedia.org/wiki/SECD_machine is an interesting example of something between lisp, forth, and traditional assembly.