Contact Before Separation: Membrane Ontology and the Conditions of Determinability

Modern ontology typically begins with already separated entities and treats boundaries as secondary devices that divide, filter, or regulate exchange between them. This paper reverses that order. I argue that whatever can be determined must be distinguishable, and whatever is distinguishable must belong to a prior field of common determinability. The primitive ontological structure is therefore not separation as such, but difference under continuity. In the broader Semantic Physics program, this primitive condition is named Proto-∇; membrane names its minimal local articulation as contact under preserved distinction. On this basis, the paper deduces a minimal membranal grammar: a surface of articulation, a gradient across that surface, a mode of touchability, and a capacity for holding. The original MEMBRANE equation of Semantic Physics is then reconstructed as the regional formal expression of this more general structure and reformulated as the membranal contact integral [M=\iint \kappa(\sigma(t,x)), h(t,x), \lvert \nabla \Psi(t,x)\rvert_{\partial\Omega}, dA, dt.] Under this reconstruction, (\partial\Omega) is a contact manifold, (\lvert \nabla \Psi\rvert_{\partial\Omega}) encounter intensity, (\sigma) the condition of touchability, and (h(t,x)) ontological holding. Consciousness is no longer the starting point of the theory but one dense regional regime of (M). The argument is then unfolded across philosophy, biology, consciousness, language, polyphony, and engineering. Biology appears as a privileged but non-founding regional intensification; consciousness as a recursive and phenomenally manifest case; language and polyphony as sites where meaning arises through sustained contact rather than transfer; and engineering as the design problem of preserving membranal integrity under pressure. A final chapter cautiously opens a cosmological horizon without overclaiming. What the paper offers, however, is not yet a fully operational physics of membranal regimes. It offers a transcendental reconstruction of the minimal contact-grammar required for determinability, together with a formal semantics for describing its regional intensifications. The result is a membrane ontology in which contact is prior to separation in the order of determinability.