One is a wooden column, the east; B is the tree of flowers and fruits, the East.
C is the fire of the sun, south; Ding is the fire of lamps and candles, Nan.
E is the soil of the city wall, China; I am an idyllic land, China.
Geng is the axe gold, west; Xin is the gold in western jewelry.
Ren is the water of the northern rivers; Decne is the water of raindrops, north.
The Origin of the Theory of "Five Elements"
During the Spring and Autumn Period and the Warring States Period, Zou Yan and his school, who were in the academic center of Qi State at that time, used ancient astronomy, simple Yin-Yang theory and "five-quality theory" to integrate astrology-Yin-Yang and five-element theory with keen vision and superb wisdom.
This theory stands out among hundred schools of thought, and it was accepted, absorbed, reformed and innovated by almost all thinkers in the Qin and Han Dynasties, which constituted the skeleton and soul of Qin and Han thoughts.