This is almost a unique living landscape in Shanghai. Why is it unique to Shanghai? At one time, Shanghai's housing area was second to none in the country. At that time, the urban areas were basically bungalows, which was called alley in Shanghai dialect. The average family has three to six children. A complete family is like a pigeon coop. The air in Shanghai is humid, so washing clothes and airing them has become a big problem. Smart Shanghainese want outdoor space, so Longmen came into being. Later, old Shanghai moved from Lane to residential area, and the habit of drying clothes outdoors still remained. The dense Longmen is still a landscape in Shanghai.