Abstract: A modular display unit that may be assembled without tools and without attachment hardware includes two or more shelves having spaced-apart elongate apertures, and two or more pairs of upright members. Each of the pairs of upright members extend through two or more of the elongate apertures. The upright members may include notches or other features that are configured to engage the associated shelf. One or more wedges extend through the elongate apertures between each of the pairs of upright members, and urge the upright members against the shelf. Optionally, one or more dowels slidably engage apertures in the shelves to provide a back support for display items. The shelves may optionally include a longitudinal groove along an upper surface to support display items such as compact and/or digital video disk cases.