art of illumination (p. 115):

          Painting in this same age was also able to display 
     its excellence especially in the making of miniatures upon 
     glass set against a gold-leaf background. A certain Greek 
     named Bounneris signed one of these (Plate 102a) with 
     portraits of a mother and two children, and another 
     similar work, unsigned (Plate 102g), shows an agreeable 
     male likeness. This is a fine aristocratic art which was to 
     give rise later to the art of illumination on vellum; and it is 
     an art contemporary with the philosopher Plotinus, a man 
     more sensitive to fine art than ever Plato or Aristotle had 
     been.