The Battle of Anghiari (Leonardo da Vinci)
In 1504 Leonardo da Vinci was given the commission by gonfaloniere Piero Soderini, a contract signed by Niccolò Machiavelli, to decorate the Hall of Five Hundred. At the same time his rival Michelangelo, who had just finished his "David", was designated the opposite wall. This was the only time that Leonardo da Vinci and Michelangelo worked together on the same project. The painting of Michelangelo depicted an episode from the Battle of Cascina, when a group of bathing soldiers was surprised by the enemy. However Michelangelo did not stay in Florence long enough to complete the project. He was able to finish his cartoon, but only began the painting. He was invited back to Rome in 1505 by the newly appointed Pope Julius II and was commissioned to build the Pope's tomb.
Separation of Light from Darkness
At the center of the composition, God is shown in "contrapposto" rising into the sky, with arms outstretched separating the light from the darkness. Michelangelo employed in this fresco the challenging ceiling fresco technique of "sotto in su" ("from below, upward"), which makes a figure appear as if it is rising above the viewer by using foreshortening. The contrapposto pose was also used by Michelangelo in the "David". It is reported that Michelangelo painted this fresco in a single "giornata", that is, a single working day of approximately eight hours. During Michelangelo's lifetime, this fresco was considered evidence of the painter's technical prowess at its peak. For instance, Giorgio Vasari (1511–1574), Michelangelo's student and biographer, wrote in 1550: