Quote 6 of 6

From On Photography, by Susan Sontag

There is something on people's faces when they don't know they are
being observed that never appears when they do.  If we did not know
how Walker Evans took his subway photographs (riding the New York
subways for hundreds of hours, standing, with the lens of his camera
peering between two buttons of his topcoat), it would be obvious from
the pictures themselves that the seated passengers, although
photographed close and frontally, didn't know they were being
photographed; their expression are private ones, not those they would
offer to the camera.
		-- p. 37

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