This paper proposes a structural interpretation of two foundational phenomena in modern physics: the invariance of the speed of light and the nature of gravity. Within the ontological framework of The Is (I → D → S → A → F), both phenomena are explored as complementary consequences of a common underlying structure — the metric field gμν. Four minimal structural axioms are introduced: local propagation, observer-independent structure, least action, and curvature-minimizing reconstruction. Based on these principles, an illustrative action functional is proposed. A difference field Δ(x,t) is interpreted as a carrier of structural differentiation, while gravity is explored as a curvature-based reconstruction process associated with the metric structure. The framework does not replace general relativity and does not claim new observational predictions. Instead, it offers a structural reinterpretation in which invariant differentiation (light) and structural reconstruction (gravity) emerge as complementary aspects of a common metric substrate. This release includes: Full paper (PDF) Reproducible demonstration code (Python) Documentation (README) Twelve illustrative figures Discussion of limitations and future directions Key open problems include the specification of the potential V(Δ), identification of Δ with a known physical field, derivation of the Δ → gμν formation mechanism, and integration with future Structural Cosmology developments.
Koji Okino (Mon,) studied this question.