Photography is acquisition in several forms. In its simplest form, we have in a photograph surrogate possession of a cherished person or thing, a possession which gives photographs some of the character of unique objects. Through photographs, we also have a consumer’s relation to events, both to events which are part of our experience and to those which are not—a distinction between types of experience that such habit-forming consumership blurs. A third form of acquisition is that, through image-making and image-duplicating machines, we can acquire something as information (rather than experience). Indeed, the importance of photographic images as the medium through which more and more events enter our experience is, finally, only a by-product of their effectiveness in furnishing knowledge dissociated from and independent of experience.

— Susan Sontag, On Photography, 1977