Introduction to Dunpu Hall: Between Jishu Hall and Shuangzhuo Hall is Dunpu Hall. In front of Dunpu Hall is a semicircular pebble ground. It is much lower than the street and the courtyard. During the rainy season, this semicircular pebble basin is filled with rainwater, like a cornucopia. The rainwater does not overflow, and the fertilizer water does not flow into other people's fields. What's more, the small copper coin in the pebble money pattern also has a special meaning: if you go out of the courtyard with your eyes closed and your third step happens to step on this copper coin, you will have good fortune.