Description: The Taiji is understood to be the highest conceivable principle, that from which existence flows. In contemporary terms, the Taiji is the infinite, essential, and fundamental principle of evolutionary change that actualizes all potential states of being through the self-organizing integration of complementary existential polarities. More simply, it is the co-substantial union of yin and yang, the two opposing qualities of all things. In order for 'hot' to exist, so must 'cold'. This applies in Taoist philosophy to all such contrasting systems, including good and evil, although it does not identify either side of the good-evil axis with either side of other axes such as hot-cold or masculine-feminine. From their mutual existence a state of dynamic equilibrium comes into being, which is the expression of the Taiji.