"Painting in poetry" means painting in poetry. The most precious thing in poetry is not in words, but outside words, which is the kind of artistic conception that can only be understood but not expressed. "Poetry in painting" means that painting should also have the charm of poetry, so that poetry and painting can be combined into one. Through painting images, not only the scenery and people that can be seen visually are expressed, but also what can be felt and understood visually, that is, infinite meaning can be realized from limited painting.
For example, Wang Wei's "Autumn Night in the Deep Mountains": after the rain, the mountains are empty, the autumn moonlight stands in the pine forest, there are crystal stones in the stream, there are whispers of female workers coming home in the bamboo forest, and there are lotus leaves in front of the fishing boat. What does it matter if spring is over? The prince and grandson can stay.