The dragon and the phoenix dance
The close meaning is free and unrestrained
The interpretation originally described the winding and majestic mountains, and later also described the powerful and flexible calligraphy strokes.
Source: Song Dynasty Su Shi's "Biao Zhongguan Stele": "On the mountain of Tianmu, the sweet water flows out, and the dragons and phoenixes dance, gathering in Lin'an."
Use the example to look up and see the hanging hanging on the north wall. Four large screens, written in cursive script, are amazingly brilliant. (Chapter 9 of "Lao Can's Travels" by Liu E of the Qing Dynasty)