Why is there no shadow in Chinese painting?

Chinese painting is based on lines and has no special requirements for perspective principle, unlike western painting, which pursues the representation of material space and the expansion and association of the meaning of Chinese painting to the spiritual field. In addition, because of the different pigments.

There are many different opinions about others. In short, I personally think that Chinese painting refers to one meaning, while others refer to a form. This is the biggest difference.