1museums are either planning, building, or wrapping up wholesale expansion programs
2These programs already have radically altered facades and floor plans or are expected to do so in the not-too-distant future.
3six major institutions have spread up and out into the air space and neighborhoods around them or are preparing to do so.
4Probably nowhere in the country is this more true than at the Philadelphia Museum of Art, which has needed additional space for decades and which received its last significant facelift ten years ago
