What is the 16-character formula of seal script?

The 16-character formula of seal script: horizontal and vertical, accurate position, hook in place, combined grid.

First in the middle, then symmetrically balanced left and right. Outsourcing first, then internal. For strokes with a box, generally, the strokes in the box should be written first, and then the parts in the box should be written.

Seal script, that is, a highly pictographic character; The font before official script. Seal script is divided into big seal script and small seal script.

Changes of seal script

Lishu is a font produced by quickly writing, decomposing the lines and strokes of Chinese characters into points, strokes, strokes, strokes and strokes, and writing them in a convenient position.

Official script ended the development of seal script to a higher level. However, Xiao Zhuan has a very high artistic value, which has been widely used in seal cutting and calligraphy works, and has a relatively prosperous horizontal development period in the Qing Dynasty.