All photographs… represent more or less clearly what was framed by the camera at the moment the picture was taken; they also identify the vantage point of the camera and, presumably, the photographer… [N]ot only do images have a history and a politics, but also they often have a career, traveling from one context to another, with dramatically different meanings imputed to them on the way.

John Grady (2007) ‘Visual Sociology’, pp. 63-70 in Clifton D. Bryant and Dennis L. Peck (eds) 21st Century Sociology: A Reference Handbook, Volume 2. Thousand Oaks: Sage Publications.