 In May 1434, he signed a contract for the marble pulpit on the facade of Prato cathedral, the last project executed in collaboration with Michelozzo.This work, a passionate, pagan, rhythmically conceived bacchanalian dance of half-nude putti, was the forerunner of the great "Cantoria", or singing tribune, at the Duomo in Florence on which Donatello worked intermittently from 1433 to 1440 and was inspired by ancient sarcophagi and Byzantine ivory chests.In 1435, he executed the "Annunciation" for the Cavalcanti altar in Santa Croce, inspired by 14th-century iconography, and in 1437–1443, he worked in the Old Sacristy of the San Lorenzo in Florence, on two doors and lunettes portraying saints, as well as eight stucco tondoes.