Foligno, Trinci Palace:  The Hall of Liberal Arts and Planets. In this hall the symbolic figures of the seven planets are represented (Moon, Mars, Mercury, Jupiter, Venus, Saturn, Sun) following the order of the days of the week. Each planet oversees a phase of human life that is depicted inside concentric disks where in the middle zone, the Air, the Sun and the Moon define a specific time of day. On the north wall of the Hall the Arts of Trivio (Grammar, Dialectic, Rhetoric) and of the Quadrivium (Arithmetic, Music, Geometry and Astronomy) were depicted, according to a hierarchical order of learning that leads to the point of arrival of all human knowledge, Philosophy , which triumphs in the center of th