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Madonna and Child with Two Angels
http://www.uffizi.org/artworks/madonna-with-child-and-two-angels-by-filippo-lippi/
http://www.theguardian.com/culture/2004/feb/14/art
https://www.khanacademy.org/humanities/renaissance-reformation/early-renaissance1/painting-in-florence/a/lippi-madonna-and-child-with-two-angels