18 to 19 years, 40 to 44 years, blue collar worker, caucasian, collaborating, colleague, concentration, cooperation, day, engineer, explaining, factory, goggles, guidance, head and shoulders, indoors, industry, lathe, learning, looking down, low angle view, machine shop, machine, man, mature adult, mechanic, mill, only male, overalls, precision, profile, protection, protective workwear, people, rubber glove, safety goggles, safety, skill, teaching, teamwork, technician, together, trainee, two people, working, workshop, young adult