In my view, what’s the matter of being ‘generative’ is controlling unpredictability. We were talking about this topic but I couldn’t explain my idea with my poor English.
To let some algorithm draw something is just one of tendencies that generative art has. However, if there’s no randomness in the algorithm, it just manufactures the same thing like a factory. I think being generative requires such an unpredictability rather than an algorithm. Much less programming.
Using watercolor could be generative. When I put it on a paper, it diffuses with (a sort of) randomness. Rorschach test also behaves unpredictably. But only randomness itself doesn’t turn into art. It’s just a chaos. To make it attractive as an art, we all have to understand the physics and law then control it.
Generative art might be similar to “bonsai”, I sometimes think so.