Architectural characteristics of quadrangles in Beijing

Beijing Siheyuan is a traditional building in China, named after it is a quadrangle with houses built on all sides and surrounded by four sides in the middle. That is to build a quadrangle, surrounded by houses, a four-in-one house with a yard in the middle. This is the yard. Siheyuan is located in the hutong of Beijing, the hutong in the east-west direction, and there is a big row in the south, which is the quadrangle in the south; There is a big row in the north, which is the courtyard in the north. How many yards are there in a house? The courtyard runs through the central axis, the north room is the main room, the houses in the east and west directions are wing rooms, and the south gate opens to the north, so it is called inverted seat.