„Photographers learn to interpret photographs in that technical way because they want to understand and use that ‘language’ themselves (just as musicians learn a more technical musical language than the layman needs). Social scientists who want to work with visual materials will have to learn to approach them in this more studious and time-consuming way“
— Howard S. Becker American sociologist 1928
Becker (1978) cited in: Peter Hamilton (2006) Visual Research Methods'. Volume 1. p. 214.