Abstract: Display apparatus includes at least two longitudinally extending members for operation in a vertical position, including at least four panel holders with two each of the holders secured to each member. A panel is held at its corners by each holder to extend between the longitudinally extending members. The panel holders include a facing pair of substantially rigid plates having substantially flat opposing surfaces, a rigid member separating and interconnecting the plates, including dividing protrusions to divide the volume between the plates into segments. A clamping mechanism extends from one of the flat plates toward the other and moveably held in relation to the other plate to clamp in place any member held within the volume between the two plates.