"Lewis Hine's 1920 Power house mechanic working on steam pump, one of his "work portraits", shows a working class American in an industrial setting. The carefully posed subject, a young man with wrench in hand, is hunched over, surrounded by the machinery that defines his job. But while constrained by the machinery (almost a metal womb), the man is straining against it—muscles taut, with a determined look—in an iconic representation of masculinity."
[source: http://commons.wikimedia.org/wiki/Image:Lewis_Hine_Power_house_mechanic_working_on_steam_pump.jpg]