Yang Xi
Although no autograph copies of Yang Xi's famous calligraphy have survived, one well-documented stone rubbing version of the revealed "Huangting jing" (黃庭經, Yellow Court Scripture) has been given special attention. The Song dynasty connoisseur and critic Mi Fu (1051-1107) analyzed four manuscripts of the "Huangting jing", and said the best one was written on a silk scroll with a provenance that he traced back to the early 8th century. Mi disagreed with a former owner Tao Gu (陶穀, 903-970) who said that Wang Xizhi wrote the manuscript, and concluded it was a superb example of calligraphy from the Six Dynasties period. The Ming dynasty calligrapher and painter Dong Qichang (1555-1636) was so impressed by the Mi Fu manuscript that he made a copy, recommend it as the best model for studying "kaishu" script, and included it as the first example in his classic "Xihong tang fatie" (戲鴻堂法帖, Calligraphy Compendium of the Hall of the Playful Goose). Dong's colophon attributed the calligraphy to Yang Xi himself and described it as "the traces of a holy immortal" (Ledderose 1984: 262-263, who calls Dong's attribution to Yang "extremely optimistic").
Chinese calligraphy
During the fourth century CE, calligraphy came to full maturity. The Kǎishū style (traditional regular script) — still in use today — and attributed to Wang Xizhi (王羲之, 303 CE-361 CE) and his followers, is even more regularized. reached its peak in the Tang Dynasty, when famous calligraphers like Yan Zhenqing and Liu Gongquan produced most of the fine works in Kaishu. Its spread was encouraged by Emperor Mingzong of Later Tang (926 CE -933 CE), who ordered the printing of the classics using new wooden blocks in Kaishu. Printing technologies here allowed shapes to stabilize. The Kaishu shape of characters 1000 years ago was mostly similar to that at the end of Imperial China. But small changes have been made, for example in the shape of 广 which is not absolutely the same in the Kangxi Dictionary of 1716 as in modern books. The Kangxi and current shapes have tiny differences, while stroke order is still the same, according to old style.