See my other tutorials on semi-cursive script (行書), here.
This is very similar rule to the one of cursive script (草書), where corners and straight lines are round up to loops.
The diagram (left) shows a character 為 (do / change) written in semi-cursive script. You will notice that the entire composition was softened, in comparison to the standard script (楷書) form of this character. Marked are the corner strokes, which are converted into a curved line (5th stroke), and a loop (4 dots and and hook are simplified).
Such modifications are not as common and as over emphasised as it can be observed in cursive script form of this, and other, characters. Chinese calligraphy does not offer a recipe for simplifying lines and corners with loops, and diligent studies of the Chinese masterpieces are a sine qua non stage on the path to intuitive understanding of how to apply this rule in practice.
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