Free-standing shelving system

A free-standing shelving system, comprising:

• a plurality of uprights having spaced holes therealong;
• a plurality of shelves having exterior surfaces;
• an attachment arrangement attaching said shelves to said uprights so that said shelves can extend approximately horizontally between said uprights and be supported thereby, said attachment arrangement comprising a separate corner piece attached at each corner of each said shelf on the exterior surface thereof such that said corner piece projects outwardly from the exterior surface of said shelf, and each said corner piece extending longitudinally in a direction substantially perpendicular to said shelf and having a protrusion protruding through one of said holes in said uprights;
• and
• locking members locking said protrusion in said holes of said uprights;
• wherein said uprights have exterior edges with longitudinal flanges thereon, said longitudinal flanges being positioned about said separate corner pieces projecting outwardly from the exterior surfaces of said shelves such that said corner pieces are held substantially rigid with respect to said uprights.