On earth and speaking with mortals they appear as humans, androgynous, robed plainly in white and silver. Even then they prefer to stand at a height, elevated, anywhere but upon the earth. And in flight they are transformed into great white birds, and radiant birds they remain when airborne, for their wings are too great and holy to touch the earth. To touch an angel is to be burnt beyond healing. They are creatures of fire, air, and the empyrean.