 With its intricate architecture and its complex sculptural decoration the work presents one of the most sweeping narratives of the 13th-century imagination which reflects the religious renewal and fervor of the era.On the slightly curved panels are sculpted with an expressive language the episodes of the life of Christ.The structure is polygonal (exactly as seen in the analogous works in the Baptistery of Pisa, in the Siena Cathedral Pulpit, and in the church of Saint Andrew); but this is the first example in a work of this type in which the panels are slightly curved.