What are the characteristics of Huangshan ancient calligraphy?

Huangshan's ancient calligraphy is very distinctive, and its regular script creates a so-called radiator with a tight middle palace and four layers of long paintings, called "corpus luteum"; His cursive script created another peak after Zhang Xu and Huai Su. Judging from the effect, his cursive script gave full play to the lyrical function of stippling and was highly praised by calligraphers at that time and later.