Plum Blossoms Are Counting the Forbidden City Rare Edition 13 can be read by children. According to relevant public information inquiries, it was written by Shao Yong, a scholar of Yi in the Song Dynasty, and widely circulated among the people. As a divination method derived from the "Book of Changes", the Plum Blossom Book of Changes is based on the innate order of the Eight Trigrams, and is based on the categories of the Xiang Bagua and all things. It combines Yili and Xiang numbers into one. It is simple and flexible and has been highly praised for hundreds of years.