This Chapter is an excerpt from the Yellow Emperor's Classic of Internal Medicine, specifically Chapter 15, detailing diagnostic and treatment principles based on observing a patient's complexion and pulse. Qibo, responding to the Yellow Emperor's inquiry, explains the interplay between "Measure of Disease" (assessing illness severity) and "Unusual Patterns" (addressing rare ailments), emphasizing the importance of understanding yin and yang balance. The text describes diagnostic methods focusing on the location and depth of coloration changes, pulse characteristics, and how these relate to prognosis and treatment using various remedies. Ultimately, the chapter stresses the significance of precise observation and the dynamic interplay of opposing forces in achieving healing.