How do fortune tellers read palms?

The Portrait of Ma Shenyi is the earliest existing physiognomy book in China that systematically describes people's appearance. People's destiny is not born for life, but it is a "strange" code that can detect fate from looks. According to legend, The Portrait of Ma Shenyi was written by a Taoist priest named Ma Yi, a fortuneteller in the Northern Song Dynasty. His book was written earlier, and it is the first unique physiognomy book that systematically describes human appearance.

In addition, I recommend you to read a book, Palm Reading. Both the above two books are available on Taobao.