Abstract: A display unit for exhibiting a plurality of display materials on a parallel planes spaced relative to each other as well as relative to a wall or other surface. The display unit includes a base, securable to the surface and a plurality of substantially identical spacer elements. The spacer elements are removably securable to one another in a stackable relationship. Each spacer element includes facilities for receiving and aligning other spacer elements in registration therewith and removably securing the spacer elements to one another as well as the base. A mounting facility securable to the spacer elements includes a transparent window for exhibiting the display material. In an additional feature, the display unit base includes a reversible backing member which is removably secured thereto to provide a variety of colored or textured backgrounds upon which to exhibit the display material.