Archangel Gabriel holding the sphere of light, from photographs of mosaics (6th - 7th century) formerly in Church of the Assumption, Nicaea, Asia Minor. Spirit of Christ holding the Holy Chalice, original conception by artist Sirio Tonelli. Archangel Michael holding the sphere of darkness, from photographs of mosaics (6th - 7th century) formerly in the Church of the Assumption, Nicaea, Asia Minor.