The School of Yin-Yang portrays the cosmos as a single, dynamic whole structured by the complementary forces of yin and yang. These are not merely opposites, but mutually dependent principles whose ceaseless interaction gives rise to all phenomena. Yin is associated with what is dark, receptive, and quiescent; yang with what is bright, active, and expansive, yet neither exists in isolation, and each contains the seed of the other. Through their alternation and mutual transformation, the rhythms of day and night, growth and decline, stillness and movement unfold. The universe, in this view, is not a static arrangement of things but an ongoing process of balanced alternation, where harmony arises from the appropriate proportion and timing of these two forces.

This dual movement of yin and yang is further articulated through the Five Phases, or Wu Xing: wood, fire, earth, metal, and water. These are understood not as inert substances but as recurring patterns or phases of transformation that cycle through generating and overcoming relationships. The same cyclical logic is seen in the turning of the seasons, the functioning of the body, and the rise and fall of social and political orders. In this way, the cosmos is grasped as an ordered field of resonances, where changes in one domain echo through others according to intelligible patterns. The Five Phases thus provide a subtle framework for discerning how the underlying play of yin and yang manifests in concrete processes.

Underlying these patterns is qi, the vital energy that differentiates into yin and yang and assumes the various configurations described by the Five Phases. Qi pervades all levels of reality, material and spiritual, and its flows and condensations constitute the myriad beings and events of the world. Because everything arises from and participates in this shared field of qi, the universe is seen as organically interconnected rather than mechanically assembled. Time itself is understood as cyclical, marked by predictable alternations of yin and yang that can be observed in natural and cosmic cycles. To live and govern well, in this cosmology, is to discern these rhythms and align human conduct with the self-regulating order of the cosmos.