This method originated in the Tang Dynasty. At that time, because there was no printing technology, in order to spread the works of famous calligraphers, people drew hollow characters according to the original works and filled them with black ink, so that viewers could get works similar to the original works.
Later, this copying method became a way for people to learn calligraphy, and developed into a splendid calligraphy art treasure in China. "Double hook" is also a calligraphy term. Calligraphy is called "double hook", which is used to draw a stone and hook it out along the outer edges of both sides of its stroke with thin lines.
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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. "。
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