Francisco de Zurbarán, The Lamb of God, c. 1635-40
From the Museo del Prado:
This votive image was wide-spread in seventeenth-century Spain. It represents an Agnus Dei or “Lamb of God,” in allusion to Christ’s sacrificial death to save humanity. The straightforward composition consists exclusively of an image of the young animal with its legs bound, lying on a windowsill and brightly light by a single light source.