Siheyuan, also known as Siheyuan,
It is a traditional quadrangle building in China. Its pattern is a courtyard with houses on all sides, and the courtyard is surrounded in the middle from all sides, hence the name quadrangle.
Siheyuan is a kind of house, and there is a gatehouse in front of Sanheyuan to close it up. If it looks like a "mouth", it is called a courtyard; The shape of "sky" is called binary courtyard; The shape of "wood" is called Sanjinyuan.
Generally speaking, in a big house, the first entrance is the gatehouse, the second entrance is the hall, and the third or last entrance is the private room or boudoir, which is the activity space for women or their families. Ordinary people are not allowed to enter at will. No wonder the ancients said that "the courtyard is as deep as a person." The deeper the courtyard, the less you can see its hall.