Abstract: A flat form graphic device for displaying light in patterns of different graphic shapes. The device includes glass plates which are bonded together with at least one of the plates molded with a shaped portion extending over the area of the desired shape. A cavity formed between the shaped portion and the other plate is charged with an ionizable gaseous medium, and the inner surfaces of the cavity are coated with phosphors. In one embodiment electrodes are activated for producing a gas discharge within the cavity generate fluorescent light. In another embodiment, emf radiators are mounted on the device and the radiators are operated by a control system for producing an emf field which excites the ionizable medium to generate the light. In another embodiment shields are provided for shielding out undesirable emf radiation and also for directing or otherwise influencing the illumination pattern.