It looks rather like a perpetual motion roller coaster or a suspended playground jungle gym (note the floor below). Viewed from an abstract perspective, it might even constitute a contemporary piece of sculpture. Actually, it is part of the steel framework that supports the concrete slab above, which made up the floor of the old mezzanine above the former American period rooms. It is all gone now, resulting in a cavernous and empty space. It will soon begin a process of transformation, eventually housing two of the new galleries in the renovated American wing, which is scheduled to open in spring 2009.