Noun. Something such as a picture, photograph, or piece of film used to give a particular effect or to explain something.
The moment I look at the viewfinder, the world is then confined in that rigid space. But that space, even how small, is enough to create wonder, comfort, or disturbance.
The moment I hit that shutter button, a contract between me and the world I see in that rigid space is signed. That contract is the photo.