Among the thirteenth-century windows the Western Rose alone seems to affect a rivalry in brilliance with the lancets, and carries it so far that the separate medallions and pictures are quite lost,— especially in direct sunshine,— blending in a confused effect of opals, in a delirium of color and light, with a result like a cluster of stones in jewelry. Assuming as one must, in want of the artist's instruction, that he knew what he wanted to do, and did it, one must take for granted that he treated the Rose as a whole, and aimed at giving it harmony with the three precious windows beneath. The effect is that of a single large ornament; a round breastpin, or what is now called a sun-burst, of jewels, with three large pendants beneath.

Mont Saint Michel and Chartres (1904)