This poem is the running script feature of the sage Wang Xizhi who wrote the book.
Wang Xizhi's Preface to the Collection of Lanting is known as the best running script in the world, and it is a masterpiece of Wang Xizhi's running script. According to historical records, when Wang Xizhi was drunk, he wrote "Preface to Lanting" with silk cocoon paper and moustache, and all the words he wrote were elegant and vigorous, graceful, while flying while flying, and his calligraphy was excellent.
Wang Xizhi's running script is peaceful and natural, with tactful and subtle brushwork, beautiful and graceful, and later generations commented that "floating like a cloud scares the snake".