“…In Byzantium, in contrast to the medieval West, glass itself does not appear to have been highly valued as a medium either in itself or in a symbolic sense. 16 Colours did matter, however. 17 The difference in colours between the red Mother of God at Kiti and the blue Mother of God at Hagia Sophia may have been a matter of deep theological significance (at Kiti, she is designated Hagia Maria, Holy Mary, but in Hagia Sophia there is no inscription).…”