What are the artistic features of Yu Shinan's calligraphy?

When people talk about books in the Tang Dynasty, "Southern Sect" and "Northern Sect" are the same, with Yu Shinan as the head of "Southern Sect" and Ou Yangxun and Chu Suiliang as the representatives of "Northern Sect". According to legend, when Tang Taizong arrived at Wang Xizhi's book, his word "Yan" was empty next to his word "Ge", which made Yu Shinan fill it up and show it later. Wei Zhi said, "The work of the holy family is only realistic." It can be seen that he inherited the achievements of the two kings in book style. Yu Shinan began to learn calligraphy from Zhiyong, who personally taught him testimonies. He worked very hard and tried to draw a belly book in the quilt. Therefore, the acquisition of Wang Guchuan is still based on the grand sequence. "Shu Duan" commented on him as follows: "The big rules of the big order come down in one continuous line with the positive color of the Confucius Temple tablet in Wang Xizhi's Preface to Lanting Collection, which preserved wisdom and courage, showed appearance and glory, and walked in an easy way. This is extremely dangerous, starting from anywhere, especially on the grass. " Yu Shinan's calligraphy is round and solid, soft outside and firm inside, smooth and accessible.