Huai Su (737-799), born in Lingling, Yongzhou (now Lingling, Hunan), was a calligrapher in the Tang Dynasty. Huai Su's calligraphy is characterized by cursive script. When he was writing a book, his pen was like a hairspring, and the circle rotated, as if he were scared by a snake, like a storm, his font was crazy and angry, and his lines excited a meteor. A strong thought and feeling of "going crazy to despise the world and gaining true knowledge from drunkenness" flowed out in this line of work. Because his calligraphy is bold and unrestrained, he is known as "wild grass". Wild Grass was born in the Tang Dynasty, which embodies the passion and vitality of the prosperous Tang culture.
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Huai Su's personality is bold and unrestrained, and he is addicted to alcohol all his life. Every time he gets drunk, he will write wildly, so no matter what the walls, clothes and utensils in the temple are, he will write wildly. It is said that Huai Su's books written in drunkenness are particularly excellent. There is a poem that says: "Drunk books are two or three lines, but drunk books are not allowed." Therefore, people call him a "drunken monk". Li, an imperial envoy at that time, said: "In the past, Zhang Xu's works were also called Zhang Dian, and now Huai Su's works are also called crazy monks. Who can say no to madness? " So the name "crazy element" was handed down.
Baidu Encyclopedia-Huai Su
China Net-Calligraphy "Crown" Ou Yangxun and "Crazy Monk" Huai Su