Final answer:
The composition technique using objects in the photo to frame the subject, thereby creating depth and interest, is known as framing.
Step-by-step explanation:
The composition technique you're asking about is known as framing. In photography, framing is used to draw the viewer's eye into the photo by using elements in the foreground or around the edge of the frame to create a 'frame' around the subject. This technique not only directs focus to the subject but also adds a sense of depth and interest to the photograph. Examples of framing can be anything from a tree branch to a window, or even an archway that leads the eye towards the main subject. Incorporating the rule of thirds and the concept of filling the frame with the subject can further enhance a photo's composition, making it more compelling and dynamic.