Introduction to residential buildings: Turtle Leaf Pond. Preserved to this day from the Qing Dynasty, the fish pond is in the shape of a leaf (which means fallen leaves returning to their roots), and the rock in the center of the pond is in the shape of a turtle, a symbol of health and longevity. It is not only artistically beautiful, but also embodies the yin and yang concept of garden design. It is now collected in Xuzhou Folk Museum.