John La Farge’s stained glass window reflects the Gilded Age fascination with medieval art and craftsmanship. The peacocks tail feathers are made of bits of glass in the broken jewel technique; each peony blossom is a single piece of glass moulded to catch the light differently through the day. For the composition, La Farge borrowed from many cultures: the central panel with the bird-and-flower motif evokes Chinese and Japanese screens; the lower panel emulates Pompeian architecture; and the transom above recalls the tympanum above the door to a Romanesque cathedral. Put these 500 pieces together to reveal a glowing masterpiece.