Why do people like to add borders when dealing with photos?

Aesthetically speaking, it is probably the same as the three-point painting and seven-point mounting, which has a refreshing effect. If the composition, I think ordinary photos and works of art are not simple geometric shapes, but have their own internal composition elements. If you frame them with an outer frame, you can have a strong sense of quantity and frame the gods in photos or paintings. With contrast, there is also a sense of hierarchy, giving people a better overall feeling.