Why hetuluo is an important basis of geomantic omen?

River Map and Luoshu are natural theories summarized by Fu Xishi from his observation of astronomy and geography. They have been a puzzling mystery for 5, years. Before the Song Dynasty, Han Yi was the mainstay, and there were only written records, such as copulations and hexagrams, until the Song Dynasty, when it was spread by Huashan Taoist Chen Xiyi < Taiji diagram > < River map > < Luo Shu > Such as figure, just collectively referred to as congenital figure (refers to the invention of words, there is a word later called the day after tomorrow). Zhu Xi Yu < Original meaning of Zhouyi > As the Chinese saying goes, "The book of the Right Book of Changes has the natural changes of heaven and earth, Fuxi, Wenwang and Confucius. Since Fuxi, no words have been invented, only pictures and books, and its mystery is best studied in depth. After Wenwang, there are words, but we can learn from the copula in the Chinese Book of Changes. It is impossible to pursue the truth in the content such as hexagrams and words. " Shao Yong, a philosopher in the Northern Song Dynasty, said < Books > It is an innate picture, which Zhu Xi in the Southern Song Dynasty called "the change of nature", which shows the value of this Book. Pictures and books are the basis used by the ancients to express the changes of heaven and earth. They are used to simulate nature in the form of a small world and perform ghosts and gods, that is, for divination.