The term 'wall worker' refers to three different professions: a TILER, a mason, and a paperer. A TILER is someone who lays tiles on walls and floors for decorative or functional purposes. A mason is someone who builds walls, foundations, and other structures out of brick, stone, and concrete. A paperer is someone who hangs wallpaper on walls for decorative purposes. All three of these professions involve working with walls in some way.