Yin-Yang School
350 BCE – 200 c.
Everything from the seasons to dynasties runs on the same two alternating forces and the same five phases, so nature and politics are one subject.
- Active
- 350 BCE – 200
- Where
- Qi, and then the Han court
- Also
- 陰陽家 Yīnyángjiā
- Status
- extinct as a school, pervasive as a vocabulary
- Tradition
- Chinese
The claim
Yin and yang are complementary phases of one process rather than opposed substances, and the five phases — wood, fire, earth, metal, water — generate and overcome one another in fixed cycles that apply at every scale.
What it held
The Yin-Yang school's ambition was correlative rather than causal. Instead of asking what makes something happen, it asks what a thing corresponds to — this season, this direction, this colour, this organ, this note, this dynasty. Once the correspondences are established, knowing one term tells you the others.
Yin and yang are not good and evil, and not even fixed properties. They are relative: a thing is yin in relation to one thing and yang in relation to another, as a slope is shaded on one side and sunlit on the other, which is what the characters originally meant.
The five phases add a dynamic. Wood feeds fire, fire makes ash which is earth, earth yields metal, metal collects water, water grows wood — and there is a conquest cycle running the other way. Zou Yan applied this to dynastic succession, which made cosmology politically explosive: a dynasty ruling by fire must be succeeded by water, and someone can claim to be water.
As a school it disappeared. As a framework it entered Chinese medicine, divination, music theory, statecraft and Neo-Confucian metaphysics, and it has never left.
How it argued
Systematic correlation between domains, with the cycles supplying the rules for what follows what.
What it was arguing against
Nothing systematically. The school was absorbed rather than argued with.
Where it disagreed with itself
Whether correlative thinking is explanation at all. Chinese critics from Wang Chong onward attacked the political applications as superstition while retaining the framework.
Common misconceptions
That yin and yang are opposites in conflict. They are phases of one process and each contains the seed of the other, which is what the familiar diagram is showing.
How it began
Zou Yan in the state of Qi, combining older divination practice with a cosmological scheme, and finding rulers extremely interested in the dynastic implications.
What became of it
Dissolved into the general Chinese intellectual apparatus during the Han. It stopped being a school by becoming everyone's vocabulary.
Lasting influence
Chinese medicine, acupuncture, feng shui, martial arts, the I Ching commentaries, and Neo-Confucian metaphysics. Few frameworks anywhere have had this reach.
Why it still matters
It is the most fully developed system of correlative thinking anywhere, and a useful case for asking what such systems explain and what they only organise.
Put another way
A hillside, shaded on one side and sunlit on the other, and neither side is a different hill.
Where to start
The Huainanzi's cosmological chapters, or a good account of correlative thinking — the primary sources for the school itself do not exist.
The surprising bit
Zou Yan's dynastic theory was taken seriously enough that the First Emperor adopted water as his phase, changed the imperial colour to black and the number to six, and reorganised court ritual accordingly.
In their own words
One yin, one yang: this is the Dao.
The five phases succeed one another as the seasons do.
Connections
- Influenced
- Huang-Lao School, Cheng-Zhu School
The verdict
A school that vanished by succeeding — its vocabulary became so general that nobody needed to belong to it.