I think that a photograph transmits much more signals from the past than the view of reality of that time.
The endless number of photographs thrown away from automatic machines seemingly levels our sensitivity to the surrounding reality; however, after many years when human lots fulfill, they will also become the recording of memory!
Further development of photography is the ‘birth’ of a negative. That most truthful witness became a particular soul of photography and up to the present fulfills the role of the most faithful trustee of the mystery of transmitting light. The negative has never constituted an object of such interest as a print. Virtually no one was trading negatives, and its presence in life is usually restricted to lying in drawers and hiding places.
Among many aspects of photography, one seems the most important and still unappreciated. Namely, the ability to convey the memory of the past.