Le Yi's theory is explained by the famous lower case law post. Three Kingdoms Wei Xia candidate, Wang Jinxi's book. In the Tang Dynasty, Chu Suiliang called it "exquisite brushwork and well-prepared rules" and was named the first official book of Wang Xizhi. The original has been lost, and later generations have many copies. See volumes 2 and 3 of Zhang Yanyuan's Fa Shu in Tang Dynasty and Huang Tingjing's Archaeological Compilation in Song Dynasty.
Word decomposition
Interpretation of musical happiness: happiness. Happy land. Happy. I am ecstatic. It was fun. Optimism (cheerful spirit, full of confidence in the development of things) Lotte (content with the status quo without any worries) What makes people happy: Have fun. Amuse. Be willing to do sth: Be willing to do sth