What does the combination of movement and stillness mean?

The combination of movement and stillness is a technique commonly used to describe scenery in compositions.

Mobile, that is, things that move and make sounds, etc.

Quiet, that is, things that don’t move.

eg. The starry sky at night is like a white paper with ink sprayed on it. A golden meteor flashes past quickly, breaking the tranquility of the night.

In this sentence, the starry sky is static and the shooting stars are moving. So this sentence uses a combination of movement and stillness.

Sometimes adding some sentences that combine movement and stillness in the text will make the composition more beautiful.

Hope this helps.