This Chapter is a dialogue from Chapter 57 of the Yellow Emperor's Classic of Internal Medicine, focusing on the colors of channels and vessels in the body. The Yellow Emperor questions Qi Bo, a renowned physician, about the varying colors observed in these vessels. Qi Bo explains that the channels have consistent colors associated with specific organs (heart-red, lungs-white, etc.), while the vessels' colors change depending on the season and the presence of cold or heat. Yin vessels reflect their corresponding organ color, but yang vessels show variable hues reflecting the body's condition. The appearance of all five colors together signifies an imbalance of both cold and heat.