
The theory and design of wuxing were already widely used in medicine, health keeping, and economy and politics as early as over 2,000 years ago. The theory underlying wuxing deals with correspondences and correlations among various processes. Each system in the world is per-ceived to be in a state of dynamic equilibrium, with five processes corre-sponding to wuxing in constant interaction. Dong and change are shown in relation to the dynamic of the entire natural world.

Wuxing generates and promotes one another in the following se-quence: fire arises from wood, earth from fire, metal from earth, water from metal and wood from water.
Wuxing controls and checks one another in the following sequence: wood is under the control of metal, metal of fire, fire of water, water of earth and earth of wood.
Wuxing and bagua are both based on the same philosophy. Each of bagua diagrams also has a corresponding phase: qian (≡) (metal), dui (≡) (metal), li (≡) (fire), zhen (≡) (wood), xun (≡) (wood), kan (≡) (water), gen (≡) (earth) and kun (≡≡) (earth).