The words in Preface to Lanting Collection are like floating clouds. If you are as agile as a dragon, what is it called?

In Preface to Lanting Collection, the word "words floating like clouds and agile like dragons" is called "pen and ink verve" to describe Wang Xizhi's calligraphy style. His calligraphy strokes are light and elegant, like floating clouds, but also vigorous and powerful, like a dragon soaring. This charm was very unique in the calligraphy circle at that time, and was called "Lanting Charm" by later generations, which became a classic in the history of calligraphy in China. Preface to Lanting is one of Wang Xizhi's representative works and one of the most famous calligraphy works in China's calligraphy history.