This Chapter from the Yellow Emperor’s Classic of Internal Medicine details a dialogue between the Yellow Emperor and Qibo concerning the principles of yin and yang. Qibo explains the cyclical relationship between these opposing forces, illustrating their presence in both the cosmos and the human body. He describes three yin and three yang channels, outlining their respective functions and interconnectedness, emphasizing the importance of their harmonious balance for health. The text uses anatomical locations and meridian terminology to explain these principles, highlighting the concept of a unified, cyclical flow of energy within the body. The interaction between yin and yang is presented as essential for maintaining health and the natural order.