Introduction to Butian Square: Butian Square is built according to the Bagua layout and is an innate Bagua diagram. According to ancient records, the Xiantian Bagua Diagram was invented by Fuxi. The eight groups of Yao symbols on the periphery represent the eight most basic factors that make up our world. "Heaven, Earth, Water, Fire, Wind, Thunder, Mountain and Ze" are called Bagua. This is a product of ancient my country. According to the interpretation of later Confucian classics, this process is called Bagua. "Tai Chi generates two rituals, two rituals generate four images, and four images generate Bagua." The outermost part is a diagram of the twenty-four solar terms, which represents the four images. The annual sacrificial hall is held here.