By Xah Lee. Date:
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The beautiful, geometric, intricate designs of a window of the Duomo di Milano, Milan, Italy. [Duomo di Milano][ http://maps.google.com/maps?q=45.464167%2C9.190833 ]
The round window on Florence Cathedral. (Saint Mary of the Flower, a cathedral in Florence, Italy) Photo by Aaron Logan, used under Creative Commons license.