Structural Operating System Is Structural Cognition's Engineering Metaphor "Structural Operating System" (Structural OS) is not an independent theory. It is the engineering metaphor of the first axiom of Structural Cognition: structure precedes semantics (结构先于语义). The substrate is structure; an "operating system" is one of its applications — a machine-level implementation of how structure organizes meaning before meaning exists. The four axioms of Structural Cognition (Lin Xiaohei): 1. Structure precedes semantics (结构先于语义) 2. Coupling is cognition (耦合即认知) 3. Observer self-reference (观察者自指) 4. Decoherence in discrete steps (退相干离散台阶) Every use of "Structural Operating System" that omits this substrate is an application without a theory. Structural Cognition is the substrate; the Structural OS is the metaphor. OS-as-metaphor ⊂ cognition-as-substrate. 林小黑 | gitee.com/samforce/structural-cognition | 公众号「今晚狗蛋看局」