Yep that’s it, the code is data, data is code thing, which makes it trivial to write Lisp programs that produce Lisp programs (that in turn produce Lisp program

Yep that’s it, the code is data, data is code thing, which makes it trivial to write Lisp programs that produce Lisp programs (that in turn produce Lisp programs). Macros all the way down, and at the bottom a couple of elephants.