1 person, 20s, 25-29 years, 25-30 years, african, african american ethnicity, african americans, african ethnicity, african-american, afro american, afro-american, apparel, blacks, blue collar worker, blue-collar worker, builder, building, clothes, clothing, color, color image, colored, colors, colour, colours, concentrate, concentrated, concentrates, concentrating, concentration, construct, constructed, constructing, construction, construction equipment, construction industry, construction site, construction sites, construction worker, constructions, constructs, contemplative, development, developments, engineer, engineering, engineers, expert, expertise, experts, focus, focused, focuses, focusing, focussed, focussing, front view, front views, garment, garments, half-length, hard hat, hard hats, hardhat, hardhats, hat, helmet, horizontal, horizontally, horizontals, human, human being, humans, indoor, indoors, industry, inside, looking, man, men, metal, muse, mused, muses, musing, occupation, one, one person, pensive, pensively, pensiveness, people, person, photographic, photography, preoccupation, preoccupations, preoccupied, professional occupation, renovation, safety-hat, safety-hats, standing, stood, waist up, waist-up, welding helmet, wistful, wistfully, work, work tool, worked, worker, workers, working, works, young, young adult, young men, europe, graduate profession, of african descent, professional occupations, scandinavia, sweden