Fuxi observed the universe in Guatai Mountain and thought hard. Suddenly, a dragon horse flew out of the dragon horse hole, spread its wings and landed on the distraction stone. The black-and-white pattern of the dragon horse deeply attracted Fuxi, and Fuxi suddenly realized that the law of the world was originally "Yin and Yang", and everything in the world always followed the law of birth, aging, illness and death. Everything that develops upward and flourishes upward is "Yang", and everything that develops downward and declines downward is "Yin". According to the design of the dragon horse, the eight diagrams were drawn, which is the legend of "river painting" in history.
Eight diagrams are eight different natural phenomena represented by "-"Yang and "-"Yin, and they are three important things according to "heaven and earth". The reason is that there is no circulation of words in Fuxi era, and the meaning can only be expressed by "painting", that is, "image". Some experts think that the Eight Diagrams symbol is the oldest writing in China, while others think that the Eight Diagrams symbol is the embryonic form of writing. In Fuxi era, there were only "images" without words. People can understand the intention to express by looking at "image", explain the attributes of things with "image", and make living utensils according to "image". Eight trigrams, namely, gan (), Kun (), Zhen (), Xun (), Kan (), Li (), Gen () and Dui (), are the classification and induction of everything in the world. Fuxi's original images when he created gossip are: walking is heaven, Kun is earth, earthquake is thunder and sadness. Generally speaking, meaning is eight basic unchangeable symbolic connotations: dry tune, Kun Shun, smoked gold, Kanjin, separation, root and antithesis.
The appearance of gossip was firstly the need of people's production and life at that time, followed by the formation of yin-yang concept and eight-way concept.