Write official script with big white clouds or middle white clouds.

Baiyun is in use. Because the middle white cloud is more refined and standardized than the big white cloud in form, it is suitable for presenting the line changes and stroke characteristics required by official script. The curved part of a white cloud finger. In China's calligraphy, the changes of zigzag white clouds are very rich, including big white clouds, middle white clouds, little white cloud, long white clouds and short white clouds.