Logo doesn't get enough credit. It is more than just a system for turtle graphics, but a real programming language with a lot of similarity to Lisp. Brian Harve

Logo doesn't get enough credit. It is more than just a system for turtle graphics, but a real programming language with a lot of similarity to Lisp. Brian Harvey at Berkeley used to be proponent of even using it as an alternative to Lisp for teaching functional programming to undergraduates.