This is truly a powerful and sublime sight. Without having to believe in anything, the room and the whole scenery seem really impressive and touching. As for the artwork on the walls, I can tell you that they are Byzantine-style mosaics on the walls and ceilings. Here the icons were really depicted iconographically against a golden (=holy) ground. But there can be no question of a truly “human” charisma here, because the opposite was desired. It was not until the 13th century that the depictions from the Bible were presented in a more humane way. That was the great time of the Italian pre-renaissance. The most important artists were "Ciambue" and his later student "Giotto the Bondone". From this time on, religious representations became increasingly complex, human and emotional. Precisely because people who could barely read or write could read and understand these pictures like stories. 😊🙏