Think of it as a variant on a theme. In Bruce Norris's play, Clybourne Park, the dramatic plot begins with a stock portrayal of oft-glorified 1950's suburban America. A white middle class family is packing to move house. The home is cheerful to the signal of nausea.Their black maid and her husband are going above and beyond to help. All is good in the Commons to start with but then things start to unravel.