What idioms can be used to describe the vivid momentum of calligraphy?

(of writing style) like floating clouds and flowing water-natural and fluent.

[pronunciation] [pronunciation]

poplar

plum

stretch

[explanation] 1. Metaphor poetry is pure and chic; 2. Metaphor is insignificant.

[Source] Stone "Pushing the Official Book with Xie": "Showing calligraphy and poetry; Familiar with it; Roughly like running water; Initial uncertainty; But always do what you do; Often unscrupulous. "

[example] 1

Su Shi's "Red Cliff Fu" is really like ~, handy.

[near meaning] write freely.

[antonym] affectation