What are the characteristics of Liu Gongquan's calligraphy?

The predecessors commented that Yan Zhenqing's ci was full of "sinews" and Liu Gongquan's ci was full of "bones", so it was called "Yan Liu Jin Gu". Song Fan Zhongyan entrusted Shi: "The pen to prolong life, Yan Gu." The word "bone" means strong and magnificent. Mrs. Jin Wei's "Pen Map" said: "Those who are good at strength are skinny, and those who are not good at strength are fleshy; The skinny and fleshy one is called Jin Shu, and the fat and fleshy one is called Ink Pig. " There are many people who talk about "bone" in the history of calligraphy. Taking "a little like falling rocks" as an example, it refers to the power to unite the past movements, which is the expression of the artist's heart, but it is not nervous, but powerful and delicate. This is the so-called "bone". Zong Baihuayun, a modern aesthete, said: Bone is a powerful and prominent pen and ink, which exerts a kind of power from the inside. Although we don't talk about perspective, we can have a three-dimensional sense and produce a moving force for us. The word "tendons and veins" has multiple meanings, either referring to the style of writing, or referring to the connection and strength of tendons and veins when writing a book. Tendon is also associated with meat, which is called "tendon". Yan and Liu Ye said that the remarkable characteristics of comparing them are: Yan Shu has many muscles, but he is not boneless, and Yan Zhenqing's book also emphasizes the power of bones; Liu Shu's bones are bare, but they are not meatless, but tend to be thin, and Liu Gongquan attaches great importance to bone method.