This paper investigates the structural conditions required for the sustained existence of time in a closed universe. Rather than proposing new physical laws, dynamical models, or empirical predictions, the work identifies necessary structural constraints that any universe capable of sustaining internal temporal ordering must satisfy. The central claim is that exact global completion must be structurally forbidden in any universe where time persists. A system that could fully resolve all global constraints would admit a terminal state in which no further internal ordering of events is possible, and time would cease. Because time is observed to persist, completion must be ruled out in principle, not merely avoided dynamically or probabilistically. The paper argues that sustaining time requires closure without completion, enforced symmetrically and without privileged boundaries or directions. Curvature is identified as the minimal structural mechanism by which such symmetric closure can be achieved while forbidding finite completion. Within this framework, the constant π appears not as a causal agent or physical constant, but as the invariant quantitative measure of enforced incompletion arising from symmetric metric closure on curved, boundaryless structures. Time is treated operationally as the sustained ordering of unresolved relaxation. As long as global resolution cannot complete, local relaxation processes must continue, and ordered change cannot cease. Differences in experienced temporal rate arise from variations in access to unresolved structure, rather than from an imposed flow of time. The results are structural rather than empirical. The paper does not claim that the universe possesses a specific global geometry, does not derive gravity or other interactions, and does not advance testable predictions. Instead, it constrains the class of admissible physical descriptions by identifying conditions that must hold in any universe capable of sustaining time as an internal ordering of change. This work forms part of the broader Gravitype research program, which explores how non-completion manifests locally in discrete substrates, giving rise to confinement, propagation limits, relaxation-based temporal ordering, and gravity-like behavior. The present paper addresses a logically prior question: why non-completion must exist at all.
Nicholas Dean de St. Croix (Wed,) studied this question.