Who's Cao Sheng?

Zhang Xu, a calligrapher in Tang Dynasty. Zhang Xu, a native of Wuxian County, Suzhou (now Suzhou, Jiangsu), was a calligrapher in the Tang Dynasty, and was good at cursive writing. His calligraphy has won two titles, which is original and innovative. The regular script "Notes on nirvana in fire" adopts the brushwork of Ou Yangxun and Yu Shinan, which is dignified and rigorous, without losing the rules, showing the exquisiteness of regular script. His cursive script is called "crazy cursive script", which makes the pen fall before the intention, and the book is connected with the heart, thus becoming the founder of China's crazy cursive script. His cursive script, Li Bai's poems and Pei Min's sword dance were praised as "three wonders" by Tang Wenzong. Zhang also writes poems. His poems are better than seven. His works have been handed down to this day and have a far-reaching impact on future generations.