What is a legal post?

Fa Tie, first named in the Song Dynasty, is one of the carriers of the ancient calligraphy art in China. Generally speaking, it refers to engraving the ink of famous calligraphers in past dynasties on stones or boards, and then developing it into ink books, binding them into volumes or volumes. This kind of seal cutting can not only spread the ancient calligraphy, but also expand its influence. It is also a model for learning calligraphy, so it is also called calligraphy post. In addition to calligraphy, "Fa Tie" also refers to spells of magical figures written in Buddhism and so on.