A barrier formed from a plurality of identical modular units that have an essentially planar front panel and triangular shaped top and bottom plates extending rearward from the front panel. Adjacent units are interconnected to one another at their terminal vertices by a square tubular member. A square shaped opening is formed approximately centrally through each of the triangular shaped plates. In addition, elongated linkages may be provided at about the midpoint of each side edge for purposes of interconnecting units that are positioned adjacent to another unit so as to assist in the formation of the overall barrier. The linkages provide pivotal movement between adjacent barriers through a range of angles from about 90 degrees (to provide a corner arrangement) to 180 degrees (to provide a straight wall arrangement).