"While we cannot describe its appearance (the equivalent), we can define its function. When a photograph functions as an Equivalent we can say that at that moment, and for that person the photograph acts as a symbol or plays the role of a metaphor for something that is beyond the subject photographed."

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There was the pedestrian who wedged himself into the crowd, but there was also the flneur who demanded elbow room and was unwilling to forego the life of the gentleman of leisure. His leisurely appearance as a personality is his protest against the division of labour which makes people into specialists. it was also his protest against their industriousness. Around 1840 it was briefly fashionable to take turtles for a walk in the arcades. the flneurs liked to have the turtles set the pace for them.

— Walter Benjamin