What is the significance of the invention of writing brush?

Brush calligrapher

① Zhongyou (15 1-230), with the correct word. He is a member of Yingchuan County, Yuzhou (now Changgedong, Xuchang, Henan). A famous calligrapher and politician from the late Han Dynasty to the Three Kingdoms Cao Wei period. Zhong You's calligraphy styles are diverse, including seal script, official script, original script, running script and cursive script. Its calligraphy is simple and elegant, with alternating font sizes and strict and meticulous overall layout. Zhang Huaiguan's book end said: "Chang Yuan's true books are peerless, but they are too teachers, so they are gentle and prepared. There are many different interests between stippling and painting, which can be described as profound and antique. Since the Qin and Han Dynasties, there has been only one person. " He is quite accomplished in calligraphy, which promoted the development of regular script (lower case) and was honored as the "originator of regular script" by later generations. Zhong You had a far-reaching influence on later calligraphy, and Wang Xizhi and others had devoted themselves to his calligraphy. Also known as "Zhong Wang" with the calligrapher Wang Xizhi of the Eastern Jin Dynasty. In the Southern Dynasty, Yu Jianwu listed Zhong You's calligraphy as "top grade", and in the Tang Dynasty, Zhang Huaiguan rated his calligraphy as "excellent" in Book End.

② Mrs Wei, a famous female calligrapher in the Eastern Jin Dynasty (272-349). Hedong Anyi (now Xiaxian County, Shanxi Province) was born with a new name, Mao Yi. Wei Guan, whose ancestral home was in the Western Jin Dynasty, was recorded in Historical Records and was as good at cursive as Suo Jing. He is called "a set of two wonderful" and is Wang Xizhi's teacher. He studied under Taoist Zhong You and You Shankai. The eight lines of regular script handed down from ancient times in Chunhua Pavilion post and calligraphy theory's brush strokes are probably written by people skilled in this field. There are Ming Ji Tie and Wei Shi Nan Tie handed down from generation to generation. She once wrote a poem about cursive script and was entrusted to write an "urgent chapter" for the court. Its glyph changed from a square in Zhong You to a rectangle, and its lines were delicate and peaceful, elegant and graceful, and it was far away from the official residence, indicating that regular script was mature and common at that time. Song Chen Si's "Letters" quoted a book review in the Tang Dynasty, saying that her calligraphy was "like a flower arranging dancer, with low beauty; Another example is the beauty on the stage, the fairy shadow, the red lotus reflecting the water, and the blue marsh floating Xia. "