What contribution did Cai Yong make to calligraphy?

Cai Yong s Contribution to Calligraphy;

1, the original Flying White Paper. Because some strokes are like bird's head and swallow's tail, the strokes are white, and the flying pen is white and dry, like a dry pen, so it is called flying white book. This kind of calligraphy, with simple strokes, looks like a dry pen lacking ink and has a unique charm.

2. Presided over the writing of Xi Shi Ping Jing. The earliest official stone carving of Confucian classics in the history of China was carved from the fourth year of Xiping in the Eastern Han Dynasty (A.D. 175) to the sixth year of Guanghe in the Eastern Han Dynasty (A.D. 183), which was located in Luoyang Imperial College outside Kaiyang Gate of Luoyang City in the Han and Wei Dynasties, so people also called this book "Imperial College Classic". The Book of Songs is written in official script, and the font is square and very famous, so it is also called "One-word Poetry Classic".