Detail of The death of St Francis by Giotto and his workshop, showing
faces in the clouds. 1297–99. Fresco, 270 by 230 cm. (Upper Church, S.
Francesco, Assisi; Bridgeman Images).
The Presentation of the Virgin, by Taddeo Gaddi. c.1328–38. Fresco.
(Baroncelli Chapel, S. Croce, Florence; Bridgeman Images). The painting
is discussed in John White’s The Birth and Rebirth of Pictorial Space,
published in 1957.