As the old master art world has shrunk in prominence in recent years, the trend has been countered by the creative vitality of an institution that may have seemed least likely to harbor new initiatives: New York’s Frick Collection. The beloved mansion with its palmy garden court and collection of European masterpieces by the likes of Vermeer, Rembrandt, and Fragonard has always been an oasis of beauty within the city’s frenetic art scene, a place where visitors came to contemplate ke