How did the running script come from?

Running script is a writing style after cursive script and regular script. According to legend, it was written by Liu Desheng, a calligrapher in the period of Emperor Huan and Emperor Ling. Wei Heng in the Western Jin Dynasty said in "Si Ti Shu": "There are two schools, Zhong (Yao) and Hu (Zhao), who learn from each other." Unfortunately, Liu Desheng left no ink. What is a running script? In short, it is a kind of writing that is slightly modified on the basis of regular script. It is very simple to write, so it is welcomed by regular script. Running script is a writing style between cursive script and regular script, which is not as difficult to write and recognize as cursive script, nor as rigorous and dignified as regular script. So the ancients said it was "not true and not grass" It is characterized by adopting a certain cursive method, partially simplifying the strokes of regular script, changing the stroke shape of regular script and cursing the structure of regular script. In short, it is more fluent, straightforward and chic than regular script, and easier to recognize and write than cursive script. Running script is a new writing style accompanied by regular script at the end of Han Dynasty, but it was not widely used at that time. It was not until the appearance of Wang Xizhi in Jin Dynasty that it became popular. Wang Xizhi's running script originated in Liu Desheng and Zhong You, and pushed it to a quite mature height. But he left few original works, most of which were copied by later generations. His running script posts include Aunt's Post, Sunny Post in Fast Snow, Preface to Lanting, Preface to Saint Education and so on. Among them, Preface to Lanting is the most outstanding representative of Wang Xizhi's running script, which has been called the best running script in the world in all previous dynasties. Preface to Lanting Collection is March 3rd, the 9th year of Yonghe in the Eastern Jin Dynasty. Wang Xizhi and his good friend Xie An and others 12 people got together in Yinshan Lanting (now Shaoxing, Zhejiang Province), drinking and writing poems, telling each other their heartfelt feelings and merging them into praise posts. Wang Xizhi, full of passion, wrote a preface for this poem, which is the preface to Lanting, a timeless streamer. This post shows the highest realm of Wang's calligraphy art, with hidden dew on the pen and borrowing from the side pen. Charming and vigorous, natural and exquisite. The structure is diverse and ingenious. There are more than 20 words "Zhi" and 7 words "No". Although it appears repeatedly, it is not the same. In terms of composition, it is very strange that it is dense and oblique, uneven in size, and the sound is extremely strange. The ancients said that Wang Xizhi's cursive script is like "the breeze comes out of the sleeve and the next month comes into my arms", which is a wonderful metaphor. Unfortunately, this book treasure was buried in Zhaoling as a sacrificial object by Emperor Taizong, and the original will never be seen in the world.