caption: The image shows a mosaic of St. Nicholas in the Basilica of San Vitale in Ravenna, Italy. The mosaic is composed of a variety of colors and shapes, creating a beautiful and intricate design. The man in the center of the image is wearing a white robe and a golden halo around his head, and is holding a staff in his right hand. His face is illuminated by a warm light, and his eyes are looking off into the distance. The background of the mosaic is a deep blue, with a few stars twinkling in the night sky.