Abstract: A display device of the type having a plurality of parallel prisms that rotate intermittently and synchronously to present the surfaces of the different panels of each prism for view to provide different composite advertising designs. All the prisms are identical and each is formed with three identical panels that are rectangular and extend longitudinally of the prism. The panels have hinge sections formed integrally along their edges for meshing with hinge sections of adjacent panels in a piano-hinge-like arrangement. A removable hinge pin is disposed in at least one hinge connection so that upon removal of the hinge pin the adjacent panel can be swung open to allow access to the interior of the prism for changing a burned out illuminating device, such as a fluorescent or neon light.