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").
Huai Su's Autobiography
"Huai Su's" "Autobiography" (懷素自叙帖) is a representative Chinese calligraphy work written by the renowned Tang Dynasty Chinese calligrapher Huai Su in 777 AD. It is often considered today to be one of the best written cursive script (草書) works in Chinese calligraphy. The work measures 28.3 cm by 755 cm and is currently kept in the National Palace Museum, Taipei. However, recent studies on this particular piece kept in the National Palace Museum revealed that it was likely a Northern Song Dynasty modelling replica (映寫) of the original; note also that there are also other replica versions of Huai Su's Autobiography.