What is Yin and Yang in photography?

Yin sunshine is a term for portrait photography. Refers to the side light that makes an angle of 90 with the nose of the subject.

The way the sun shines and the way the sun shines will make the characters form yin and yang faces, which has certain limitations. This kind of lighting can only be used to express a special theme, such as the effect diagram that highlights the black belly of men, or to show the inner world of characters.