Peeking from the orderly calligraphy of past dynasties, most of them are original works. However, judging from the remains of Hanyuan Mo Bao in the Jin Dynasty, many famous relics are mostly "hook books" in the Tang and Song Dynasties, which is what we call "double hooks".
It is not easy for Emperor Taizong to get the original work of Lanting Gathering. Song Dynasty and Chronicle of Momo said: "The wise and brave Zen master lived in Yongxindian Pavilion for 30 years, fled seven generations of grandchildren, inherited the family law, and lived in Yongxindian Pavilion for 30 years." Choose 800 copies and spread them in Zhejiang and Beijing. Later, he passed on his disciples' discriminating ability in "Mao Tie". Emperor Taizong called it three times, which was very generous. He asked the "Mao Tie" to end. Emperor Taizong also ordered Feng Chengsu, the minister, to copy some precious posts and distribute them to relatives and friends. "。