1. Calligraphy terms.
2. The metaphor of the pen is like the traces of rainwater leaking between the walls of a broken house. Its shape is dignified and natural, hence the name.
3. "Shi Huaisu and Yan Zhenqing Discuss Cursive Script" written by Lu Yu of the Tang Dynasty recorded: Yan Zhenqing and Huai Su discussed calligraphy, and Huai Su said: "I see many strange peaks in Xia Yun, and I often use them, and they are so satisfying. It's like birds flying out of the forest, frightened snakes entering the grass, and like the road on the wall, all natural. "Yan Zhenqing said: "How is it like the leakage mark of the house?" Huai Su stood up and held the male's hand and said, "I got it!" Jiang Kui's "Xu Shu Pu" says: If there are traces of leakage in the house, it is expected that there will be no beginning or end.