The rational body came into being in the Song Dynasty, collectively called the ternary rational body, which was founded by Wang Ji, Chen Tuan and others. The main activities are in Zhejiang, Sichuan and Fujian provinces, also known as Fujian School.
Rational style is developed on the basis of situational school. On the basis of geomantic geography, the formula adds Zhouyi theory and astrology theory, and applies more theories that different aspects of the universe affect people to geomantic omen.
Compared with situational school, it pays attention to the subtle coordination between environment and people, so it is more comprehensive and practical. But it is a comprehensive school of geomantic omen with many theories.
Its theory is quite complicated, including all the theories related to numerology, such as Yin and Yang, Five Elements, Eight Diagrams, Nine Planets, River Map, Luo Shu, Astrology, Shen Sha, Kong Xuan, Liu Ren, etc., so many small sects have emerged.