Bill Sullivan's Portraits - The Subway Turnstile Pictures

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From Sullivan's website:

I developed a situation so that various subjects could be defined by the constraints of exactly the same mechanical apparatus. The scenario consisted of someone passing through a subway turnstile. At the moment that the subjects passed through the turnstile, unknown to them, I took their picture stationed at a distance of eleven feet. I stood there turning pages of a magazine observing subjects out of the corner of my eye, waiting for only the moment when they pushed the turnstile bar to release the shutter.

http://www.3situations.com/BillSullivanWorks/BillSullivan.html