For a down-to-earth power couple and their adventurous collection of photography and art, architects Pietro Cicognani and Ann Kalla with designer Thomas O'Brien create a warm New York duplex. By Martin Filler Photography by Laura Resen Produced by Dara Caponigro rays in ry to provide more ks of art. New banister me in Sir John ise museum. On an northern Italian credenza, rtrait photographs by Cindy Swedish 18th century from Brahams-Netsky, New twice: The library, all views, vise from to left: Against old leafed wall, photo by the Barth and armchair in Bergamo striped fabric. nerican redware displayed on shelves. ench 19th-century tole painted tray angs between windows; c. 1880 Baroquestyle chairs from Rose Cumming. EFTA01197863