Adult "Windows Upgrade" Stained Glass Skirt With PocketsDescription Specifications As the Gothic style of cathedral building reached its zenith in the thirteenth century, the wheel window became one of its most beloved features. Later termed "rose" windows, mullions of stone separated the individual colored glass segments into geometrical patterns that resemble a flower. In shades of blue, pink, and purple done in watercolors, this design showcases one of the medieval world's great design achievements. 95%