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 the wall opposite the window. Each planet influences a phase of human life, at each stage of human life corresponds, in the learning scale, a different discipline, each discipline is similar, for its properties, to one of the celestial spheres. The decoration is entrusted to Gentile da Fabriano, the greatest exponent of international Gothic in Italy, with aids (Jacopo Bellini, Paolo Nocchi, Francesco Giambono from Bologna and Domenico da Padova's Battista), and realized the 1411 and 1412 trails. Detail of Grammar.