Duccio di Buoninsegna, The Nativity with the Prophets Isaiah and Ezekiel, 1308–1311, tempera on single poplar panel, National Gallery of Art, Washington. https://dartabase.art/cite/nga/10

Duccio di Buoninsegna, The Calling of the Apostles Peter and Andrew, 1308–1311, tempera on panel, National Gallery of Art, Washington. https://dartabase.art/cite/nga/282