Every decorative element inside a church is never an end in itself but has the specific purpose of bringing man closer to God: the selection of subjects or episodes illustrated in the paintings, the statues on the altars, the decorations on the floor, the decorative façade elements – everything has the precise purpose of helping those who enter to pray and encounter God. Even light is exploited for this important purpose. Symbolically, light represents the presence of God. Indeed Jesus said: “I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life” (Jh 8, 12) Who lives in this light, which is God, becomes in turn a light for everyone else or, in other words, because of the example set, that person becomes the means through which God reveals Himself. In fact Jesus said "Ye are the light of the world", "Let your light shine before men, that they may see your good works, and glorify your Father which is in heaven”. (Mt 5, 13-16) That is why the windows help to create an environment conducive to meditation, silence and prayer. By filtering and manipulating light, they produce incessant plays of coloured light beams, which change according to the position of the sun and time of day. Try and visit the same church in the morning, at sunset and at night, and you will realize how the diverse lighting can deeply change the . . .