Yi Feng and the "Six Emotions and Twelve Tones": A Mathematical Cosmology in Han Dynasty Exegetical Studies

Brief Introduction

Yi Feng (c. 91 BC – 30 BC), courtesy name Shaojun, was a prominent representative of the "Qi Shijing" (Qi School of the Book of Songs) during the late Western Han period, hailing from the Qi region (modern-day Shandong province). He was not only a Confucian scholar well-versed in the Shijing but also a thinker who deeply integrated Confucian exegetics, yin-yang and the Five Phases, with mathematical logic. Yi Feng is best known for constructing the theoretical framework of the "Six Emotions and Twelve Tones" and using it as the basis for his proposal to Emperor Yuan of Han to relocate the capital. His thought exemplifies the characteristic "symbolic-numerical transformation" (xiang-shu) of Han Confucianism, closely binding moral ethics (emotions) with cosmic order (tonal laws) through mathematical models.

Core Knowledge Points

1. The Correspondence Logic Between the Six Emotions and the Twelve Tones

Yi Feng posited that there is a strict correspondence between fundamental human moral emotions (the Six Emotions) and the twelve musical modes (the Twelve Tones), viewing them as the projection of the Mandate of Heaven into human relations. He defined the Six Emotions as: Benevolence (Ren), Righteousness (Yi), Propriety (Li), Wisdom (Zhi), Trustworthiness (Xin), and Loyalty (Zhong).

* Expansion of the Six Emotions: Each of the "positive emotions" (righteous emotions) gives rise to a corresponding "negative emotion" (perverted emotion), resulting in twelve distinct emotional states.
* Mapping to the Twelve Tones: He correlated the twelve musical tones—including the Yellow Bell, Greater Lyu, Greater Cong, and others—with these twelve emotional states. For instance, he argued that "Benevolence" corresponds to the Yellow Bell and Greater Lyu, the beginning of the yang tones, symbolizing the generation and sprouting of all things.
* Core Argument: Yi Feng advocated that if human emotions align with the operational laws of the Mandate of Heaven (the waxing and waning of yin and yang), the corresponding musical tones will be harmonious, and societal politics will be clear and just. Conversely, if emotions become disordered, the musical tones will become discordant, and Heaven will issue warnings through calamities and anomalies.

2. Theoretical Origins and Purpose

This theory was not merely an acoustic study but a tool for political remonstrance. Yi Feng believed that during Emperor Yuan's reign, "moral education was not cultivated," leading to a disbalance in yin and yang and the frequent occurrence of disasters. Through the mathematical model of the "Six Emotions and Twelve Tones," he demonstrated the deviations in current political ethics (the Six Emotions) and argued for a relocation of the capital to alter the geographical feng shui ("changing its location"). This was intended to re-establish the communication between earthly and celestial qi, restore the "Six Emotions" to their proper places, and ultimately achieve political clarity.

Connection to the Hanshu (Book of Han)

In the Hanshu, Volume 49, within the biography of Yi Feng (in the section "Zhao Liu Fu Cui Xue Zhou Xuan Sui Chen Zheng Zhuan"), his figure is fully depicted.

The Incident of Remonstrating for Capital Relocation: The Hanshu details Yi Feng’s submission of a memorial to Emperor Yuan of Han, proposing to move the capital from Chang'an back to Luoyang. Citing anecdotes from the Shijing and referencing the then-current situation in Chang'an where "many people were fleeing and homeless" and "earthquakes and mountain collapses" were occurring, he argued these were omens of "yin and yang being crossed." The Hanshu* quotes him directly: "Current Chang'an... has more yin than yang... it is appropriate to relocate to the proper yang capital," showcasing his courage and strategy in using classical studies to intervene in politics.
Detailed Exposition of the "Six Emotions" Theory: The Biography of Yi Feng in the Hanshu* provides the most detailed surviving record of the "Six Emotions and Twelve Tones" theory. It lists a tabular argument where Yi Feng correlates "Benevolence, Righteousness, Propriety, Wisdom, Trustworthiness, and Loyalty" one-to-one with musical tones such as the Yellow Bell, Greater Lyu, Greater Cong, Jia Zhong, Gu Xi, and Zhong Lyu, explaining the mechanism by which "positive emotions" transform into "perverted emotions."
Historical Evaluation: In its concluding commentary, the Hanshu holds a reserved attitude toward Yi Feng’s method of "adorn politics with classical studies," deeming it overly forced and analogical. However, precisely because of this, the Hanshu* preserved Yi Feng’s original textual arguments in full, making it a crucial historical source for studying Han symbolic-numerical Yi studies and exegetical political theory.

Although Yi Feng's theory was later viewed as a form of "prophecy and esoteric cosmology" (chen-wei studies), his idea of constructing a unified mathematical model connecting ethics, music, astronomy, and geography profoundly influenced the understanding of cosmic order in the Han dynasty and subsequent eras.