MASONRY symbols: the Calipers (exactitude; ponderatezza; rigor in the judgment and surveying) the Square (moral integrity; veracit?in the opinions and the thoughts; balance and honesty of purposes) and the Book of the Sacred Law; (the elevated spiritualit?more) are considered the Three Greater Lights of the Free Muratoria; the Sun (the Light; the origin of the things - male element) the Moon with stars (I darken; the intuition and the changeability of the forms - feminine element) by day represent the alternation and the balance and night; black and white; of activity and rest; and the dialectic one of opposite - the Xilografia of XIX the century