The clouds in the sky are really full of gestures. What does impermanence have to do with the following words?

Clouds in the sky are varied and unpredictable: some are like feathers, floating gently in the air; Some are like fish scales, neatly arranged one by one; Some come and go like sheep; Some are like a big cotton wool, covering the sky all over the ground; Others are like mountains, rivers, lions and galloping horses ... sometimes they decorate the sky beautifully, and sometimes they cast a shadow over it. Just now, it was white clouds and the sun was shining; In a blink of an eye, it was cloudy and it rained cats and dogs. Clouds are like signs of weather. What kind of weather will happen when there are clouds hanging in the sky?

-"Looking at the weather from the clouds" (excerpt)

The structure of this passage is "total-minute-total", and the first sentence at the beginning is related to "some are like feathers" ... "It's raining cats and dogs.