At the simplest level, the four of them belong to a progressive relationship. 1, river map and gossip. Legend has it that Fuxi drew "Eight Diagrams" through the dragon horse's pattern (river map) and his own observation. The dragon horse's pattern is called "river map". Gossip originates from the concept of yin and yang, and Wang Wen's gossip originates from astronomical calendar, but its "root" is river map. 2. Luo Shu and the river map. They are a bit like brothers, both created by Fuxi. Explaining the word "Hutuluo", Ci Hai said: "... It is said that in Fu, dragons and horses appeared from the Yellow River, carrying a" river map "; A turtle appeared from Luoshui, carrying' Luoshu'. Fuxi painted eight diagrams based on this' picture' and' book', which was the source of Zhouyi later. " The Book of Changes is the Book of Changes. If Luoshu and Hetu are brothers, so are Yijing and Zhouyi. According to legend, The Book of Changes was deduced and summarized by Fu He (Ji Chang) according to the river map and Luo Shu (which produced the eight diagrams of the Book of Changes at the same time). It is the crystallization of China's 5,000-year-old wisdom culture and is known as the "head of the group classics and the source of the avenue". At the most basic philosophical level, the four of them are in the same strain. Hello, if you are satisfied, please adopt it.