On the artistic features of the calligraphy work Preface to Lanting. What do you think is the beauty?

Preface to Lanting was written on the spot, with a strong sense of integrity and coherence. The whole article shows Wang Xizhi's free and easy temperament, and every word in the article has its own different personality. For example, Preface to Lanting has 2 1 characters, but none of them are the same, and they all have their own different artistic techniques. Generally speaking, its artistic characteristics include: exquisite brushwork, nuance, concealment and exposure, and omnipotence of law. These characteristics are inseparable from Wang Xizhi's hard practice in calligraphy.