Revelation 15 – A vision of Heaven. When John claims that I saw in heaven another great and marvellous sign, he recalls for us the “great and wondrous sign” in heaven in 12:1 (“a woman clothed with the sun”) and “another sign . . . in heaven” in 12:3 (“an enormous red dragon”). The third sign, so long in coming, consists of seven angels with the seven last plagues–last, because with them God’s wrath is completed (v. 1).