Analysis: Elegant as clouds in the sky, vigorous as Youlong in the sky.
These two sentences are from Cao Zhi's Ode to Luoshen. "Floating like a cloud, spirit like a dragon" is a praise for Wang Xizhi's calligraphy, which means that his calligraphy is natural, elegant and harmonious as a whole.
Leak mark
If the house leaks, the rain will flow down the wall instead of rushing down, but it will definitely blow down the uneven wall, forming a very frustrating and powerful trace. The vertical painting of calligraphy should pursue such artistic effect. This metaphor was invented by Yan Zhenqing.