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Explanation: In church architecture round stained glass windows with **ray-like divisions** were sometimes termed marigold windows to distinguish them from rose windows with rounded **rose-petal-like divisions**.The plants commonly known as marigolds in American today are of the genus, Tagetes, native to Mexico and Central America and adopted into the pre-existing European marigold tradition after
their discovery by Spanish missionaries to the New World. http://www.mgardens.org/SS-3-Narration-MG.html
Asker: My attention was drawn to **beams**... that's why I didn't think about a similarity between a rose window and a **wheel** with its **spokes**. Now my recollections bring me to some long-lost images like the St. Catherine's Wheel...an emblem of St. Cath's College where I stayed for a Summer Course in Eng.Lit. (those were the days...)