The book also includes color illustrations of the organs corresponding to the five elements. For instance, the heart is the organ of fire (red) and the stomach is earth (yellow). This explains the mutually reinforcing and suppressing relationship between the various organs of the body, and their connection with the external environment.
書中並以顏色標示五行對應的器官，例如心為火（紅色）、胃為土（黃色），說明人體各器官之間相生、相剋的關係，以及與外界環境的聯繫。