Different time, different content, etc. Different time: The Spirit of Mayi was written by Mayi Taoist in the late Yuan Dynasty and early Ming Dynasty; Liu Zhuang Aquilaria Resinatum is another masterpiece of Yuan after Ma Xiang. The content is different: The Portrait of Ma Shenyi is a physiognomy work that systematically describes the appearance of ancient human beings in China; Liu Zhuang Aquilaria Resinatum is a classic that expounds the theory and skills of ancient physiognomy.