This is a typical feature of the pen used in official script, especially in official script, which almost always uses horizontal painting. The so-called "silkworm head" means that in the process of using a pen, the stroke shape formed in the process of starting a pen is written into a shape similar to that of a silkworm head. "Swallow's tail closes the pen", that is, after pressing the pen at the pen closing place, the pen is tilted to the upper right.
Thirdly, the lifting thickness changes obviously.
In seal script, there is no trace of the vertical lifting of the pen, while the official script deliberately emphasizes the lifting, which forms a significant change in the thickness and inheritance of the stroke trajectory, and the three processes of starting, walking and collecting the pen are clearly reflected. This is very similar to later regular script.
In addition, the appreciation of Lishu calligraphy also has the artistic characteristics of "turning a circle into a square, turning an arc into a straight", "turning a painting into a point, and turning a connection into a break". In other words, the straight strokes of Lishu are obviously ups and downs, and the curves are sincere and smooth, which is more vital. ? In addition, in the official script calligraphy, the application of stippling is becoming more and more mature, and many strokes of seal script are disconnected, forming an artistic effect of broken strokes and opening the door to writing. Later, regular script also had this kind of play, and the calligraphy font became more beautiful and elegant.