In this article, we present a harmonic reinterpretation of the theory of relativity, wherein the circle emerges as the mathematical entity underlying physical reality. This approach stems from a reconsideration of the Minkowskian rotation. Its imaginary character—both in angle and in time—is attributed to the observer’s embeddedness within the physical structure of reality, while the rotation itself is understood as a physical manifestation of an underlying fundamental cycle. This cycle, which operates across all physical scales, is posited as a potential organizing principle of nature, possibly reflecting a deeper layer of physical law. At its largest possible scale, this reinterpretation yields a cyclic, observer-dependent cosmological model in which the observable universe is understood as only half of a broader, more complete cosmological scheme, the other half remaining beyond direct observation. This novel perspective arises from a philosophical analysis of what is known in cosmology as the problem of the beginning, offering a logically grounded framework for the origin of the universe.