When I was a kid, one piece of software that we had during "computer class" at school was a turtle who would take instructions like "walk 8 steps, turn left 50 degrees, repeat 100x" and the path of the turtle would generate this beautiful geometric pattern.

It taught me a lot about emergent properties from simple systems (or, at least a child-like understanding of it), and the concept of having something follow I told it to do (and all the problems that arise from it).

https://docs.python.org/3/library/turtle.html