Geimer's investigations complement the history of photographic images by cataloging a corresponding history of their symptoms, their precarious visibility, and the disruptions threatened by image noise. Interwoven with the familiar history of photography is a secret history of photographic artifacts, spots, and hazes that historians have typically dismissed as "spurious phenomena," "parasites," or "enemies of the photographer." With such photographs, it is virtually impossible to tell where a "picture" has been disrupted–where the representation ends and the image noise begins. We must, Geimer argues, seek to keep both in sight: the technical making and the necessary unpredictability of what is made, the intentional and the accidental aspects, representation and its potential disruption.