Yin - Yang and 5 element theory
The ancient Chinese YIN-YANG scholars believed that there are two natural, complementary and contradictory forces in our universe. The scholars named them as YIN and YANG. These scholars also believed that our universe consisted of five basic elements, which are Metal, Water, Wood, Fire, and Earth. The Five Elemental Energies (wu sing) represent the tangible activities of yin and yang as manifested in the cyclic changes of nature which regulate life on earth.