Huai Su, born in Lingling, Yongzhou (now Lingling, Hunan), was a calligrapher in the Tang Dynasty. He is famous for "Weeds" and is known as the "sage in the grass" in history. Being a monk since childhood, I like calligraphy after meditation. And Zhang Xu, collectively referred to as "Dian Zhang Kuang vulgar".
Huai Su's cursive script is thin and vigorous, flying naturally, like a whirlwind of showers. Although his calligraphy is capricious and ever-changing, it has statutes.