Hollow characters, also known as double hook calligraphy, the so-called "double hook calligraphy" refers to hollow characters written directly in a single line. This method originated in the Tang Dynasty. At that time, due to the lack of printing technology, in order to spread the works of famous calligraphers, people put out hollow words according to the original works, and then filled them in 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 copied on a stone and hooked with thin lines along the outer edges of both sides of its strokes, which is called "double hook".
Hollow character
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