Leonardo da Vinci's Vitruvian Man (1492) was based on writings by the Roman architect Vitruvius that described the ideal human proportions that could fit within a square and a circle. This drawing represents the Renaissance ideal of using principles from antiquity to depict the perfect human form. Michelangelo's figures for the Sistine Chapel, such as his ignudi and the prophetess Sybil, similarly display classical ideals of balance, musculature, and contrapposto pose that were inspired by ancient Greek and Roman sculptures. During the Renaissance, many artists looked to works like the Laocoön, Apollo Belvedere, and Belvedere Torso for models to recreate the ideal human form.