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Madonna and Child panel painting by Giotto (Italian, 1266 - 1337); tempera on panel, circa 1310 - 15. From the National Gallery, Washington DC. (Photo by GraphicaArtis/Getty Images)

Madonna and Child panel painting by Giotto (Italian, 1266 - 1337); tempera on panel, circa 1310 - 15. From the National Gallery, Washington DC. (Photo by GraphicaArtis/Getty Images)