Santa Maria del Popolo
The architect or architects of this innovative project remain unknown due to a lack of contemporary sources. Giorgio Vasari in his "Lives" attributed all the important papal projects in Rome during Sixtus IV to a Florentine, Baccio Pontelli including the basilica and monastery of Santa Maria del Popolo. Modern researchers deemed this claim highly dubious and proposed other names among them Andrea Bregno, a Lombard sculptor and architect whose workshop certainly received important commissions in the basilica. The fundamental differences between the façade and the interior suggest that maybe more than one architect was working on the building.
Santa Maria del Popolo
This naturalistic and marvelous organ-tree could have been inspired by the descriptions of tree-shaped musical instruments in Byzantium and the eastern world or the singing fountains of Renaissance gardens in Italy. The tree had a particular significance in the context of Santa Maria del Popolo where the memory of Emperor Nero's evil walnut tree was still vivid. The flourishing oak tree also represented spiritual regeneration and the restoration of the church by the pope as part of his Christian "renovatio Romae".