 In 1546 Michelangelo produced the highly complex ovoid design for the pavement of the Campidoglio and began designing an upper storey for the Farnese Palace.In 1547 he took on the job of completing St Peter's Basilica, begun to a design by Bramante, and with several intermediate designs by several architects.Michelangelo returned to Bramante's design, retaining the basic form and concepts by simplifying and strengthening the design to create a more dynamic and unified whole.