Siheyuan Introduction:The houses in Lizhuang are almost all made of blue bricks and gray tiles, and are composed of large and small courtyards along the streets and alleys. The area of ​​a small courtyard is about 150 to 200 square meters; the area of ​​a large courtyard ranges from hundreds to thousands of square meters. The patio in the courtyard can be said to be an important part of the Lizhuang courtyard. It is paved with strips of bluestone and has a good drainage system. Its main functions are lighting, leisure, and washing and drying clothes; some also have terraces for planting flowers and plants.