@neauoire Paper computing has a soft spot in my heart because I always have the corner case of "what if we just.. lose all of our automated computing devices?"
A lot of models have been built that are simple enough to carry in your head, or on a writing surface, so that you could play Church/Turing/Godel/Post and re-derive the rest of computer science from scratch.
As educational tools they're vital, because in order to program effectively, you must "role-play" as the machine. Paper first!
@wryl yes! And, it has some traits that are like self-obviation, you can memorize the mechanical aspects of a computation enough that you don't need to do it anymore.
http://postgrowth.art/self-obviating-systems-En.html