A first panel includes an optically transmissive body having a front side and a rear side. The body has a width, a height, and a depth. The depth is substantially less than either of the width or the height. The body includes a first edge on a first side defining a first tongue protruding outwardly from the first edge. The body includes a second edge on a second side defining a first groove recessed within the second edge. The first tongue is adapted to couple to a corresponding groove and the first groove is adapted to couple to a corresponding tongue. A first optical film is coupled to the front side of the body.