"We regard the photograph, the picture on our wall, as the object itself (the man, landscape, and so on) depicted there. This need not have been so. We could easily imagine people who did not have this relation to such pictures. Who, for example, would be repelled by photographs, because a face without color and even perhaps a face in reduced proportions struck them as inhuman."

Source: Ludwig Wittgenstein, David Francis Pears, Brian McGuinness (2001). “Tractatus Logico-philosophicus”, p.89, Psychology Press