Book excerpt: Windows were the major emphasis of Louis Comfort Tiffany's work. Yet today, most Tiffany windows have never been seen by the public. Alastair Duncan has tracked down virtually every window still extant and has documented examples that have disappeared or been destroyed. Along with providing photographs of over 200 windows, more than half in color, Duncan describes how the glass was made and the windows constructed; Tiffany's designers and the workings of the Window Department; his critics and international exhibitions; window themes; signatures; chronology; and a complete list of all Tiffany windows.