Laws of Nature as Structural Constraints

Philosophical accounts of laws of nature oscillate between treating laws as governing necessities that actively constrain reality and as descriptive regularities that merely summarize observed patterns. Scientific practice relies on laws to support explanation, counterfactual reasoning, and prediction, yet existing accounts struggle to reconcile this modal force with ontological economy without either inflating metaphysics or reducing laws to empirical correlations. What remains lacking is an ontological framework that explains how laws exhibit stability, necessity, and explanatory relevance without positing governing entities, primitive modal facts, or purely descriptive regularities. Using the Three-Circle Ontology, this paper interprets laws as structural constraints operating within a domain of structured possibility rather than as metaphysical governors or empirical summaries. The account distinguishes ontological ground, structural constraint architecture, and rendered empirical regularities, clarifying how lawlike stability emerges without ontological inflation. The proposal is not a new physical theory, not a semantic theory of laws, and not a defense of dispositional essentialism or Humean reductionism. Its primary contribution is to reframe laws as constraint structures that delimit admissible configurations and sustain modal stability while preserving ontological parsimony.