What's the unique meaning of the name Siheyuan?

The "four in one" is the combination of heaven, earth, man, self and four sides, which complement each other. The theory of harmony between heaven and earth and between people is basically consistent with Mencius', and the harmony of time, place and people is the core of harmony. The "four in one" of the enterprise fully embodies the efforts of the four in one to build a national brand. "Han Shu's Second Wide Biography": "Six laws and five tones, praising the holy meaning; God and music are four in one, each with its own image. "