Stigmergy

Stigmergy is a mechanism of indirect coordination in which the trace left by an action in some shared medium stimulates the next action — by the same agent or by another. The term was coined by French biologist Pierre-Paul Grassé in 1959 to describe how termites build complex mounds without any central plan: each termite reacts to the local state of construction left by its predecessors.

Global order emerges from purely local responses. The same dynamic governs ant foraging trails, slime-mould pathfinding, and many other examples of self-organisation in nature. What makes stigmergy interesting outside biology is that it is the operational logic behind a great deal of human coordination at scale. A Wikipedia article evolves through edits that respond to the current state of the page; an open-source codebase grows through patches that respond to the current state of the repository; a market price moves as traders respond to the price itself. No participant needs the full picture.

This is why stigmergy is foundational to open-source software, commons-based peer production, and many DAO workflows — each rests on a persistent shared medium that records contributions and lets the next contributor pick up where the last one left off. For heterarchical systems, stigmergy answers the load-bearing question: how do you get coordination without command? The answer is that coordination need not flow through people at all — it can flow through the artefact itself, naturally resistant to capture and decentralised by construction.