Layer photos are having 3 parts, foreground, mid ground, and background in photos. They are the best for landscape photographs. Wide angle lenses work great combine with small apertures to achieve sharpness throughout an entire scene from the foreground to the background. The viewer’s eye should be lead through each of these areas without encountering any distractions or disturbances. When everything in a photograph is in focus, the eye often wanders and you need to make sure that every layer of the photograph foreground, mid ground, and background contain some interest.