The Atracta Co. Jewelry Store Optical Illusion Display Stand. Philadelphia, ca. 1900. The customer is prompted to look through the viewer, directly in front of which stands a sign reading: “Look! A W.W.W. guaranteed ring hangs back of this board. Look through this instrument and the wood becomes transparent”. Indeed, when the customer peers inside, he sees a piece of jewelry instead of the sign. Hardwood viewing instrument on felt-covered surface, wooden base stand. 23” tall.