In each arm of the transept, there is a huge rose window, with more windows beneath it. At Chartres the stone ribs of these windows made a fairly simple flower shape, but here at Amiens the stone ribs have gotten all twisted, so that they look like flames. Art historians call this “Flamboyant” Gothic, after the French word for flames, “flambes”. Today “flamboyant” means showoff-y, and that’s what these windows kind of are.
Like Chartres, Amiens also has patterns of black and white marble on the floor. One part of the design makes a labyrinth – a maze to walk along. People would walk the maze while praying or meditating.
Learn by doing: find a labyrinth or draw one with chalk and walk it
Outside of Amiens cathedral
Cathedral: The Story of Its Construction, by David Macaulay (1981). Beautiful drawings and clear text explain exactly how medieval craftsmen built a cathedral, from foundation to the stained glass windows. Easy reading.