Chapter 2: Origins: From Ancient Experience to Rational Germination

Section 1: Wind, Clouds, and Breath – The Primitive Experiential Field of "Qi"

To understand the original nature of any concept, one must inquire into its origins. Historically, the character "qi" has been explained as either "cloud and vapor" (云气) or "fodder for guests" (馈客刍米). Regardless of the interpretation, it points to something perceptible and fluid—either the ever-changing clouds and mists in the sky or the rising steam from cooking rice.

This point is crucial. From its inception, "qi" was not a purely speculative product but a naming of bodily experiences and natural observations.

The Pre-Qin people lived in a world deeply connected to nature. They breathed daily, feeling the air enter and exit their chests; they observed celestial phenomena, seeing clouds gather and disperse, winds rise and storms brew; they lit fires for cooking, seeing water boil and steam rise, and firewood burn to ash; they cultivated fields, feeling the alternation of the four seasons. These experiences formed the raw material for the concept of "qi."

Master Zhuangzi, in his Discourse on the Equality of Things (齐物论), offers a brilliant description:

"The Great Expanse exhales and its name is Wind. It is only when it is not acting that it is so. When it acts, the myriad openings roar. And do you not hear it whistling$7 The crevices of mountains and forests, the hollows of great trees a hundred spans around, are like noses, like mouths, like ears, like cleavages, like holes, like depressions, like basins, like pools. They whistle, they shriek, they bluster, they sigh, they cry, they wail, they moan, they howl. The former sings out, and the latter answers with a hum. When the wind is gentle, the harmony is slight; when the wind is strong, the harmony is great; when the fierce wind passes, the myriad openings become empty."

This passage is often read as literature, but its physical insights are not to be overlooked. Master Zhuangzi says, "The Great Expanse exhales and its name is Wind"—the earth exhales a breath, and this is wind. The wind passes through various-sized openings in the mountains and forests, producing different sounds; the strength of the wind determines the volume of the sound—"When the wind is gentle, the harmony is slight; when the wind is strong, the harmony is great."

Is this not a simple acoustic observation$8 Sound is the result of the vibration of gases, the shape of the openings determines the nature of the sound, and the strength of the wind determines its volume. Master Zhuangzi uses "qi" to unify the explanation of the cause of wind and the production of sound, the underlying mode of thinking is entirely physical: starting from observable phenomena to find a unified principle of explanation.

Section 2: The Doctrine of Six Qi – The Earliest Classification System of Natural Forces

If Master Zhuangzi's description carried the grand air of a philosopher, then the medical diagnosis of Yi He (医和) recorded in Zuo Zhuan reveals a more precise and analytical aspect of Pre-Qin theories of qi.

In Zuo Zhuan, during the first year of Duke Zhao (昭公元年), the Marquis of Jin fell ill, and Yi He was sent from the state of Qin to diagnose him. After his diagnosis, Yi He offered a judgment of profound theoretical depth:

"Heaven has six qi, which descend to generate the five flavors, manifest as the five colors, are signaled by the five sounds, and when excessive, cause the six diseases. The six qi are: Yin, Yang, Wind, Rain, Darkness, and Brightness. They are divided into four seasons, ordered into five junctures, and when exceeding their bounds, become disasters. Excessive Yin causes cold diseases; excessive Yang causes heat diseases; excessive Wind causes diseases of the extremities; excessive Rain causes abdominal diseases; excessive Darkness causes confused diseases; excessive Brightness causes heart diseases."

This passage is rich in information and deserves careful analysis.

First Level: Classification. Yi He divides the fundamental forces of nature into six categories—Yin, Yang, Wind, Rain, Darkness, and Brightness. These six "qi" are not randomly listed but are a systematic compilation of the primary physical factors in the natural environment perceptible to the human body: the two poles of temperature (Yin cold and Yang heat), atmospheric movement (wind), the water cycle (rain), and the two poles of illumination (darkness and brightness).

Second Level: Order. "They are divided into four seasons, ordered into five junctures"—the six qi are not chaotic; they have temporal order, operating according to the rhythm of the seasons. A crucial realization is implied here: natural forces are regular and predictable.

Third Level: Causality. "When exceeding their bounds, become disasters; when excessive, cause the six diseases"—if any qi is in excess ("excessive" meaning "excessive"), it will lead to corresponding diseases. Excessive Yin qi causes cold diseases, excessive Yang qi causes heat diseases, and so on. This is a clear causal reasoning model: environmental physical factors are the cause of diseases, and there is a correspondence between the type of disease and the causative factor.

Let us ask: Is this metaphysics$9

A metaphysical system might say, "Heaven's mandate is unknowable" or "Ghosts and spirits send diseases." What Yi He established, however, is a framework for explaining diseases that is entirely based on natural causality. In this framework, there is no intervention of gods or spirits, no unknowable fate—only the orderly operation of natural forces and its disordered consequences. "Qi" here is the rational naming of natural forces.

Section 3: Boyang Fu on Earthquakes – A Mechanical Model of Qi

Earlier than Yi He's discussion of the six qi is the account of Boyang Fu (伯阳父) on earthquakes, recorded in Guoyu (Discourses of the States). In the second year of King You of Zhou (780 BCE), the three rivers all trembled, and Boyang Fu commented:

"The qi of Heaven and Earth does not lose its order. If it exceeds its order, the people have disturbed it. Yang is suppressed and cannot emerge, Yin is pressed and cannot steam. Thus, there are earthquakes. Now the three rivers are indeed trembling, which means Yang has lost its place and presses down Yin. If Yang is lost and within Yin, the river sources will be blocked; if the sources are blocked, the state will surely perish."

This discourse deserves extreme attention, as it may be one of the earliest records in Chinese intellectual history to explain geological phenomena using "qi."

Boyang Fu's reasoning is as follows:

The qi of Heaven and Earth has its normal operational order ("does not lose its order").
The cause of earthquakes is "Yang is suppressed and cannot emerge, Yin is pressed and cannot steam"—Yang qi is trapped underground and cannot vent upwards; Yin qi is compressed and cannot circulate. The two forces mutually press each other and cannot be released, thus causing earthquakes.
The consequence of earthquakes is the blockage of river sources, which in turn affects the survival of the state.

What is the core of this explanatory model$10 It is the accumulation and release of force. Yang qi (which can be understood as underground heat, active subterranean energy) is blocked by Yin qi (which can be understood as the oppressive force of the Earth's crust). Energy cannot circulate normally, accumulates to a certain point, and then erupts as an earthquake. While the specific mechanisms differ entirely, the basic model of "energy accumulation—exceeding a threshold—sudden release" is shared, showing a striking similarity in the structural thinking with modern plate tectonics and elastic rebound theories.

Even more noteworthy is Boyang Fu's methodological premise: "The qi of Heaven and Earth does not lose its order." This statement implies that the workings of nature are orderly and regular, and earthquakes are not punishments from deities but the result of disturbances in the natural order. This is a thoroughly naturalistic stance.

Thus, we can preliminarily conclude: In the origins of Pre-Qin theories of qi—whether in observations of daily experience, the construction of medical theories, or the explanation of geological phenomena—"qi" played the role of a unified name for natural forces. It was not metaphysical speculation but a tool for the Pre-Qin people to rationally grasp the perceptible and observable physical world.