The outline of the body near the mountain is clearer, and we can distinguish the details; When observing distant objects, our visual angle is more gentle, and the light reaching our eyes is more dispersed, resulting in a perspective effect, which leads to the blurred outline of the distant mountains and can't see too many details.

This phenomenon can be used in art, photography and so on. , through the use of visual depth clues to express the effect of distance and space.