New York architects Tod Williams and Billie Tsien have been tapped to design the Barnes Foundation's new home in downtown Philadelphia. Conceived as a building within a building, the idiosyncratic design replicates the '20s galleries displaying Albert Barnes' collection of impressionist and modern art in his former residence in nearby Merion. Once completed, it will join the husband-and-wife team's other esteemed buildings, including New York's American Folk Art Museum. However, it may take some time, as petitioners are still fighting the Barnes move, with community activists opposed to the displacement of the juvenile facility currently occupying the new site.