The following materials are for reference... The distinction between calligraphy schools is particularly obvious in the north and south. The north is marked with a stele, and the south is marked with a post. The Southern Tie is the ancestor of the round brush, and the Northern Stele is the ancestor of the square brush." ??"Although it is a small skill, it is very similar to the characters and atmosphere of the society. It is not surprising that it is like this! "The theory of the difference between the southern stele and the northern stele has been discussed extensively since the Qing Dynasty, such as Ruan Yuan's "Lun of the Northern and Southern Calligraphy Schools" and "Lun of the Northern Stele and the Southern Tie", Bao Shichen's "Yi Zhou Shuang Ji", Kang Youwei's "Guang Yi Zhou Shuang" "Ji", each has its own discussion. "The big one is the essence of economy, character, and ethics, and the small one is the end of epigraphy, carving, and games. Almost all of them are closely related to geography. How great is the influence of natural forces on human affairs! "(Liang Qichao's "Theory of Chinese Geography", "The Ice Drinking Room Collection")