Ying-Yang I

Yin-Yang is a dominant philosophical concept that is shared by most schools of Chinese philosophy. It is used to explain 3 basic things:
· yinyang as the coherent fabric of nature and mind, exhibited in all existence,
· yinyang as jiao (interaction) between the waxing and waning of the cosmic and human realms, and
· yinyang as a process of harmonization ensuring a constant, dynamic balance of all things.
The earliest instances that have been found of ying-yang are inscriptions made on oracle bones where ying and yang are descriptions of natural phenomena such as weather conditions etc.
The interpretation of ying-yang that has stood the test of time for the longest is related to the concept of ‘chi’ or vital energy. According to this interpretation ying and yang are ‘chi’ which operate in the universe. In the “Duke Shao” chapter of the Zuozhuan (The Book of History), yin and yang are first defined as two of six heavenly qi:
There are six heavenly influences [qi] which descend and produce the five tastes, go forth in the five colours, and are verified in the five notes; but when they are in excess, they produce the six diseases. Those six influences are denominated the yin, the yang, wind, rain, obscurity, and brightness. In their separation, they form the four seasons; in their order, they form the five (elementary) terms. When any of them is in excess, they ensure calamity. An excess of the yin leads to diseases of cold; of the yang, to diseases of heat.
Ying yang has also been spoken of as some concrete substance (xingzhi) according to which yixing and yangxing explain all the concepts in the universe and yang was identified with the sun and ying with the moon.
It is believed that both human as well as heavenly bodies have ying-yang and that they are present everywhere to bring about harmony in the universe.