"From the throne went out flashes of lightning and peals of thunder. Burning before the throne were seven flaming torches, the seven spirits of God, and in front of it what seemed a sea of glass, like a sheet of ice. In the centre, round the throne itself, were four living creatures, covered with eyes, in front and behind. The first creature was like a lion, the second like an ox, the third had a human face, the fourth was like an eagle in flight. The four living creatures, each of them with six wings, had eyes all over, inside and out; and by day and by night without a pause they sang: 'Holy, holy, holy is God the sovereign Lord of all, who was, and is, and is to come!'"
-- Revelation 4.5-8 NEB