Ba Gua - Relation To Other Principles

Relation To Other Principles

There are two possible sources of bagua: The first is from traditional Yin and Yang philosophy. The interrelationships of this philosophy has been attributed to Fuxi in the following way:

無極生有極、有極是太極、
太極生兩儀、即陰陽;
兩儀生四象: 即少陰、太陰、少陽、太陽、
四象演八卦、八八六十四卦
The Limitless (Wuji) produces the delimited, and this is the Absolute (Taiji)
The Taiji produces two forms, named yin and yang
The two forms produce four phenomena, named lesser yin, great yin (taiyin also means the Moon), lesser yang, great yang (taiyang also means the Sun).
The four phenomena act on the eight trigrams (bagua), eight eights are sixty-four hexagrams.

Another philosophical description of the source is the following, attributed to King Wen of Zhou Dynasty: "When the world began, there was heaven and earth. Heaven mated with the earth and gave birth to everything in the world. Heaven is Qian-gua, and the Earth is Kun-gua. The remaining six gua are their sons and daughters".

The trigrams are related to the five elements of wu xing, used by feng shui practitioners and in Traditional Chinese Medicine. Those five elements are wood, fire, earth, metal, and water. The Water (Kan) and Fire (Li) trigrams correspond directly with the Water and Fire elements. The element of Earth corresponds with both the trigrams of Earth (Kun) and Mountain (Gen). The element of Wood corresponds with the trigrams of Wind (Xun) (as a gentle but inexorable force that can erode and penetrate stone) and Thunder (Zhen). The element of Metal corresponds with the trigrams of Heaven (Qian) and Lake (Dui).