The only mezzanine system I have seen in a museum is in a neighboring city, and was put in as an afterthought when they realized the room *really wasn't big enough*. The registrar there tells me it's awkward to get to, especially since the room wasn't designed for it so the ceiling is really low up there! They have things stored up there that have been there for years, still in their packing boxes (acidic cardboard--luckily it's mostly ceramics). Janis Beth Wilkens Curator of Collections Museum of York County 4621 Mt. Gallant Road Rock Hill, SC 29732 803-329-2121 Fax: 803-329-5249 Email: [log in to unmask] ("Janis" in subject line)