Robert Marichy, a wood turner in Arinthod in the Jura department, is a 'blue collar' as evidenced by the overalls he is wearing in this photo. The expression, born with the big enterprise between the end of the 19th and the beginning of the 20th centuries, characterizes the workers by their work clothes. It distinguishes them from the ‘white collars’ which refers, by contrast, to the white shirts worn by bosses and office workers.