In mid-May the Barnes Foundation opened at its new location in the cultural corridor of downtown Philadelphia. A cloud of controversy followed it to the end. The new building, handsome if flawed, from the gifted New York studio of Tod Williams and Billie Tsien, has attracted its share of criticism. The entrance, initially hard to find, is at the back of the building facing towards the car park and away from the parklands. The passage from entrance to galleries is awkward and inauspicious.