In recent years, a good deal of attention has been paid to the place of typology in late medieval art. This way of thought so characteristic of the Middle Ages, in which Old Testament persons and events are seen to have a prefigurative relationship to those of the New, was a popular teaching device. It is nowhere better seen than in the Biblia pauperum or picture Bible, which originated in a mid-thirteenth-century Dominican milieu and was probably inspired by the altar piece of Nicholas of Verdun, made in 1181. The pages of these books contain drawings that show the typological relationship between Old and New Testament events by means of a center roundel depicting some episode of Christ's life, known as the anti-type, flanked by two Old Testament scenes, the types, which were thought to prefigure it. Appropriate Bible prophecies in banners heightened the visual impact of the drawings for the literate. From its inception, the Biblia pauperum was of enormous importance for northern European art, and its influence can be seen well into the Reformation.