Right at the top of the triforium, Chagall’s stained glass windows in Metz Cathedral are less visible than in Reims, but still as easy to recogise. Incrusted with saphirs, topaze, rubies, emeralds and amethysts, they were mounted between 1958 and 1968. Last stop before home. Montés tout en haut du triforium, les vitraux de Chagall …