The mosaic of Saint Dominic is made of glass from Murano, Venice. The glass tesserae are cut and set into wet lime plaster as a working surface, before being set permanently into mortar. Saint Dominic is shown with bare feet, carrying a crossed staff, signifying his itinerant life. He also carries a copy of the gospels from which he preached. The vestments he wears, for the Dominican order, were developed in his own lifetime.