Why is Song's calligraphy called Shoujinti?

Although Song Huizong and Evonne were bad emperors in politics, they were brilliant in art. He is good at not only writing, but also calligraphy and painting. Later generations praised him for his "exquisite calligraphy and painting, which is second to none in ancient and modern times." His calligraphy is full of calligraphy, calligraphy and cursive script, the most famous of which is his original "The Book of Thin Gold". This kind of art refers to a regular script, which is thin and strong. It uses all the extension methods such as painting orchids and bamboo, with sharp pen and elegant calligraphy. The structure is perfect and beautiful, and the law is strict from beginning to end, just like ladies dancing in harmony. Wandering around the court without disorder fully embodies the characteristics of court life. "Bo Jin Shu" is not only unique among many calligraphers in the Song Dynasty, but also unique in ancient times. This makes Song Huizong different, even though he can't dominate the political arena.