The physis and nomos controversy first emerged in ancient Greek thought. This article explores Castoriadis' reactivation of the issues concerned; in particular, his radicalization of Aristotle's conception of physis and nomos. It suggests that nomos appears as multifaceted in his work. However, three key variations may be identified: empirical nomos, normative nomos and generic nomos. Empirical nomos signifies the human creation of laws. It challenges the notion, long held in western philosophy, that Being = being determined. Although all laws are (...) by humans created and thus in one sense autonomous, Castoriadis further distinguishes normatively between those societies which embrace their self-creating and self-transformative capacity and those which obscure it. Normative nomos, then, refers to the autonomous or heteronomous institution of society. The third sense of nomos refers to the creation of form. In this generic sense, it is argued that the debate shifts from the human to the non-human realm; that nomos also manifests itself in the realm of physis. (shrink)