Refers to the original vitality of jade wood. It's too easy when there is no gas, the gas starts too early, the shape starts too early, and the quality begins with Tai Su. The state in which gas, shape and mass are mixed but not separated is called chaos.
Wang Fuzhi expounded Zhang Zai's theory from the viewpoint of unity of opposites and insisted on Taiji. It is asserted that Tai Chi and the two instruments are a physical relationship, not a father-son relationship. It is considered that Taiji is the unity of Yin and Yang, with the nature of movement and the law of change. All phenomena are different manifestations of this unity of yin and yang, which gives play to the idea of "the spirit of harmony" as the origin of the world.