This white paper proposes the Cosmic Particle Sea Hypothesis, a unified theoretical framework that redefines space, time, matter, and motion based on structured internal dynamics. Drawing inspiration from the triadic Yin—Yang model of the I Ching, it posits that every unit of reality—particle, field, or organism—is composed of a threefold polarity configuration whose asymmetry generates motion and interaction.The hypothesis reinterprets time as a subjective observational metric, and space not as vacuum, but as a medium composed of microstructured, polar field units. Matter and energy emerge from variations in Yin—Yang composition and purity, leading to the diversity of physical forms. Living systems contain high-purity Yang channels—ling pathways—which are sensitive to energetic disruption by heavy Yin substances, explaining radiation and toxicity phenomena from a structural perspective.Celestial bodies are modeled as internally polarized systems (e.g., stars as Yin—Yin—Yin; planets as Yang—Yang—Yang), whose complementarity accounts for both gravitational attraction and orbital motion. The framework is supported by seven proposed experiments that range from twin-clock tests to quantum interference and space-medium validation.This theory invites collaboration from physicists, philosophers, and experimentalists seeking new ways to test foundational assumptions. It is offered as a metaphysically grounded yet empirically open model of a structured, living, and intelligible cosmos.