Cynefin domain
Complex
The Cynefin domain in which many agents interact and cause and effect can only be understood in hindsight; the way forward emerges from experiments.
A useful test: several contradictory but coherent hypotheses exist, and testing them all is not feasible. The approach is probe–sense–respond with safe-to-fail experiments, and practice is emergent. A festival campsite is complex — thousands of people with few binding constraints produce event after event that nobody can predict.