What do "floating like floating clouds" and "pretentious like a startling dragon" mean?

1. Pinyin: piao ruo fu yun

Explanation: It describes calligraphy that is very good and floats like clouds.

Example: Wang Xizhi’s calligraphy is really like floating clouds.

2. Jiao Ruo Jīng lóng [jiǎo ruò jīng lóng]

Source: "Book of Jin·Biography of Wang Xizhi": "You are especially good at official script, the best in ancient and modern times, commentators call it The style of writing is as floating as a floating cloud and as strong as a frightening dragon."

Definition: Jiao: vigorous. It is often used to describe vigorous calligraphy strokes or graceful dancing postures.

This is a sentence to evaluate Wang Xizhi’s calligraphy

It describes the brisk, agile and powerful strokes.

Source: "Book of Jin*The Biography of Wang Xizhi": "He is especially good at official script and is the best in ancient and modern times. Commentators call his writing style as floating as a floating cloud and as powerful as a startling dragon."