“Modern investigators of miraculous history have solemnly admitted that a characteristic of the great saints is their power of "levitation." They might go further; a characteristic of the great saints is their power of levity. Angels can fly because they can take themselves lightly.
This has been always the instinct of Christendom, and especially the instinct of Christian art. Remember how Fra Angelico represented all his angels, not only as birds, but almost as butterflies. Remember how the most earnest mediaeval art was full of light and fluttering draperies, of quick and capering feet.”