[SmileyJames]

I think the field of automata has some lovely diagrams.

https://en.m.wikipedia.org/wiki/Automata_theory

I'm sure many are familiar with state diagrams, directed graphs that can be used to explain regular expressions or any other FSM

Turing machines also can be represented with a diagram featuring a "tape" - so elegant

Professor Rick Thomas made a great impression on me whilst lecturing on the subject of Automata