Objective Reality: A Quantum–Classical Relational Whole and Its Single Bridge Law

Objective Reality presents a unified account of physical reality in which quantum possibility and classical actuality are inseparable aspects of one evolving state. The quantum state carries the coherent possibilities—the amplitudes, phases, correlations, and interference structure—while a single history coordinate identifies the configuration that is temporarily actual. Neither component alone constitutes the physical world; objective reality is the evolving relation between them. This relation is expressed by the complete state Aₜ = (ρₜ, Dₜ, Cₜ, Rₜ, uₜ, Ξₜ), advanced through a single reversible bridge law, Aₜ₊Δₜ = BΔₜ[Aₜ]. Unitary quantum evolution generates the probability current. That current determines the admissible transitions between candidate classical sectors. A reversible selector then converts those transition weights, together with a retained auxiliary coordinate, into one actual successor. Decoherence and spectral stability identify durable record-bearing sectors; conserved quantities are carried through explicit accounting variables; and the inverse bridge reconstructs the preceding complete state. The construction proves normalization, Born equivariance, reversible selection, complete-state invertibility, conservation, classical reduction, relativistic integrability under microcausality, and the persistence of exactly one history coordinate. When the ensemble distribution agrees with the quantum sector weights, the bridge transports it into the next Born distribution while each individual realization follows one determinate history. The resulting formalism connects quantum evolution, measurement, wave–particle behavior, emergent classical records, and relativistic state evolution within one mechanics. It also establishes a common foundation for investigating selected-source gravity, emergent spacetime, vacuum energy, black-hole information, and experimentally falsifiable quantum–classical bridge dynamics.