We have become almost blase about the way that specialist underpinning firms can shift whole structures - chapels, lighthouses, etc - from one location to another. But they may soon face their largest challenge yet. The Barnes Foundation, that idiosyncratic organisation that houses some of the greatest art works of the late nineteenth and early twentieth centuries, is in dire financial straits and considering a move from the outskirts of Philadelphia to the campus of Philadelphia Museum of Art. One option is to transport the 75-year-old mansion that houses the collection to a new home. This is installation art with a difference.