A living cell does not simply exist within a boundary; it continuously produces the very boundary that distinguishes it from its environment, replacing membrane components as it goes, so that the boundary is an ongoing activity rather than a fixed wall drawn once and maintained passively. Autopoiesis names this self-producing structure, and it generalises well beyond biology: any system that persists over time by continuously remaking the distinctions that define it — an institution redrawing its own remit, a discipline redrawing its own boundaries — is autopoietic in the relevant sense, whether or not it involves cell membranes. DistinctionHabitat reappears here at its most fundamental: the distinctions a system produces to separate itself from its environment simultaneously function as the habitat conditions under which the system's own further self-production can continue. A system that stops remaking its boundaries has not become stable; it has stopped being a system in the sense that matters and started merely persisting as an inert artefact.
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