a. Arches are a great example of how man-made structures can be used as framing in photography. When we compose a shot, we have two frames to consider. We make sure nothing disturbing is included in the frame (the arch). And the main subject is well positioned within the frame (the arch).
b. Natural framing elements in photography, such as trees and tree branches, stones and rocks, and small water ponds, serve to enhance compositions by enclosing the main subject within the frame. These natural elements not only add visual interest but also help to direct the viewer's focus and enhance the overall aesthetic appeal of the photograph.