What are the artistic features of Huang Tingjian's calligraphy?

Huang Tingjian, (1045 ~ 1 105), also known as the rich man, was born in Fenning, Hongzhou (now Xiushui, Jiangxi). The official position is, and the official department is a foreigner. He is a famous poet and calligrapher. One of the four great calligraphers in Song Dynasty. For example, Su Shi said: "Lu Zhi's little book is elegant, with the concept of equality as a side word, with reason as a clever plan for traveling, and with open books and detailed matters, which can be described as three evils." Legend of Zhao: "Huang Shu is like a scholar who sticks to the Tao and is full of learning. He sits on a high horse and fights for the pliers." Wang Shizhen said: "I have seen Gu Shu in my life, taking the side danger as the potential and taking the escape as the merit. old bones is in troubled times and all kinds of things have come out." Kang Youwei said: "The Book of Song Scholars focuses on the valley and changes for no reason."