Figure 4. Neijing Tu (Diagram of the Inner Realm), 13th century. This ‘inner’ landscape depicts the body as a microcosm, where a forest symbolizes one of the essential bodily functions called gan, the herb of immortality is cultivated in a field, various figures represent lords and stars, and Ancient Taoist medico-philosophical concepts are symbolized by such signs as yin and yang. Stone rubbing from the Baigunguan Temple, Beijing.