What are the characteristics of tulou?

Tulou is a building with walls (a few are made of adobe bricks), columns and beams. All of them are made of wood, which is made of clay mixed with unfired sandy clay and clayey sandy soil in a certain proportion and rammed with sandwich board. Tulou is a pearl of oriental civilization and a unique mythical mountain village residential building in the world. With its long history, unique style, huge scale and exquisite structure, it is independent of the world residential architecture art forest. Earth buildings are mostly square or round, mainly distributed in Nanjing and Yongding, especially the grotesque round earth buildings are the most rich in Hakka traditional colors and powerful. The round earth building is a model of Hakka folk houses and can be called the first building in the world. Earth buildings not only have the unique function of defending the enemy, but also have the characteristics of earthquake prevention, fire prevention, theft prevention, good ventilation and lighting. Because of the thick soil wall, it is warm in winter and cool in summer.