Notre Dame On The Inside - 5 - North Rose Window © Kids Hoodie

Notre Dame's north transept wall consists of a rose window surmounting 18 lancet windows. The wall was built circa 1250-1260 while Jean de Chelles was the main architect of this project. Most of the original 13th century glasswork is still intact, filtering light into a rainbow of blues, reds, greens, browns and yellows. The wide spectrum of colors achieved in Medieval France's stained glass windows was produced by varying both the proportion of metal added to molten glass and the temperature to which the mixture was heated. Impurities in the metals, bubbles in the cooled glass and variations in the thickness of the cut panes would ultimately contribute to the jewel-like quality of finished windows. Colored glass was cut to size by heat...