Abstract: Modular constructional units are used to form a combined storage bin and display assembly for rolls of decorative paper such as wallpaper. The modular constructional units are vertically stacked and horizontally adjoined by interlocking surfaces while the units extend along an essentially straight-line path and form storage bins and displays disposed at an angle with respect to the straight-line path. Each constructional unit includes three mutually-adjoined side walls to a square prism which defines the shape of the bin. These side walls define a horizontal bin floor, a vertical bin rear end wall and a vertical longitudinal bin side wall. An outwardly-facing vertical display wall is projected from the bin side wall beyond the forward edge of the bin floor. The display wall and the bin side wall form a side wall for a horizontally-adjacent storage bin.