Abstract: A plurality of light boxes adapted to be transported and stored in a knocked-down and disassembled condition to be readily assembled, set up and connected together, with a divider between adjacent light boxes and with a front translucent panel for each light box which is lit up by lights within each light box. Each translucent panel having a flange, with the flanges of the adjacent panels being held in abutting relationship by clamping means which eliminates mullions therebetween and with the clamping means so constructed to eliminate and/or reduce the shadows on the panels at such junctures. The adjacent panels presenting when lighted a continuous surface where the dividing lines between adjacent panels are substantially imperceptible.