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This work introduces a minimal modal structure required for observable physics. The central object of analysis is the relation between a local null state (identified with the photon) and a maximally global informational configuration. Using a three-valued Łukasiewicz algebra and a cyclic modal operator Γ satisfying Γ^3 = I, the paper shows that: (1) only a fully null state satisfies the complete set of physical conditions needed to function as the local element in a modal relation with global data;(2) the modal structure {0, 1/2, 1} together with Γ forms the minimal algebra consistent with null propagation;(3) standard physical frameworks (GR, QM, LCDM) implicitly require this structure through their dependence on null geodesics, photon-based measurement and the existence of the CMB;(4) a modal transition from MAY to CANNOT at the particle horizon yields an empirical prediction: enhanced suppression of large-angle CMB correlations around multipoles ℓ ≈ 3–5. The purpose of the paper is not to propose a new dynamical theory, but to identify a structural condition underlying the observability of physics. The work includes a falsifiable prediction concerning the CMB quadrupole–octupole regime and outlines a test protocol based on Planck 2018 data. Further papers will elaborate holographic, twistor and geometric consequences of the modal framework.