Abstract: A lampshade made of a sheet of aluminum which is shaped by photochemical etching to form a one piece blank having six trapezoidally shaped side wall panels connected to one another in sequence in side-by-side relationship by fold lines, a plurality of locking tabs extending out from the side wall panel at one end of the sequence, an auxiliary panel extending out from the side wall panel at the other end of the sequence, and a plurality of locking slots formed on the auxiliary panel for engagement by the locking tabs to hold together the side wall panels at the ends of the sequence so as to form the lampshade.