Author here. If anyone wants to see an example of an awesome program you can run on the 520 byte version of my lambda calculus virtual machine (Blc) then check out <a href="https://github.com/woodrush/lambdalisp">https://github.com/woodrush/lambdalisp</a> If you run the command in that project, it'll download my VM from the blog post, build a 20kb lambda expression you can pipe into it, and BOOM a fully object-oriented LISP REPL will appear in your terminal. It's like magic. For an example expression, try typing (+ 2 3) and hit enter. Then type (let ((a 2) (b 3)) (+ a b)) and hit enter. You need an x86 linux machine to do this right now.