They competed on the theme of the Binding of Isaac, with shapes and dimensions quite similar to those of the panels of the existing doors, and were judged the following year by a commission consisting of 30 various artisans and four consuls of the Arte di Calimala.

Father and son were to be paid two hundred florins a year, supervised by a three-member commission including Palla Strozzi (who was also Ghiberti's client).

On June 1, 1407, since the delivery of three reliefs a year was no longer feasible, a new contract was made, in which Lorenzo is listed as workshop leader and Bartolo is among the assistants.

The master agreed therein not to accept other commissions without the permission of the consuls of the Arte di Calimala and to work the wax and bronze himself, especially the chiseling of the castings, particularly for the parts that required more care, such as the nudes or the hair.

The lost-wax technique had not yet been fully mastered, and using rather viscous alloys, the reliefs came out of the terracotta mold as rather rough sketches that then had to be smoothed, filled in the gaps, and provided with all the details of the finished product.

[2] In March 1423 the partial gilding of the doors was deliberated, to increase their prestige: according to Krautheimer, the frame and jamb design (cast probably after 1424) were also created at this time.

The figures are prominent within the Gothic quatrefoils, but more characterized (compared to the other fourteenth-century door) from a spatial and perspective point of view, with acute physiognomic individuation, especially in the heads.

[6] There are numerous formal cross-references between the figures, balletic tones and refined hanchements, to which is added the perfect rendering of animals, plants, objects and architecture.

In the lower panels, the care with which the pieces of furniture near the Evangelists and Doctors are rendered stands out, their clothes flowing with solemnity but also with a real poise that never lapses into excessive mannered artificiality.