ｒｅａｃｈ

Ah, to me “emergent behavior” has at least a partial connotation of some expectation on the part of the designer. Like, in robotics or AI you intentionally build a system with pretty simple individual pieces that display an “emergent behavior” when combined.

But that’s probably influenced by my field, because “emergent behavior” applies to a lot of natural phenomena too that aren’t clearly “designed”.