The story goes like this: once, the emperor went to the northern suburbs to offer sacrifices, asked Wang Xizhi to write his congratulatory message on a board, and then sent workers to carve it. The sculptor was very surprised when he carved. Wang Xizhi's calligraphy and brushwork actually penetrated into the wood for more than three points. He praised: "The words of the general of the right army are really incisive!"
The incisive description of calligraphy is vigorous and powerful, which also means that the analysis of the problem is very profound.