How does Zheng Banqiao practice calligraphy?

There is also an inscription on Zheng Banqiao's calligraphy practice: When Zheng Banqiao studied calligraphy, he often gestured in the air with his fingers, as if he were possessed. Once, he waved his finger to write in his sleep, and his finger touched his wife's body. His wife shouted, "Everyone has his own body. How do you scratch my body! " Zheng Banqiao was surprised. After waking up, he pondered his wife's words silently and understood that it would not be successful to imitate the ancients blindly. So from then on, he no longer imitated the ancients, but based on originality and finally became a whole. He named it "littering all over the street". He became famous for it.