A. Yarbro Collins has proposed that the principle of recapitulation is evident in five cycles of visions (Combat Myth, 32–44): (1) the seven seals (6:1–8:5), (2) the seven trumpets (8:2–11:19), (3) seven unnumbered visions (12:1–15:4), (4) the seven bowls (15:1–16:21), with the Babylon appendix (17:1–19:10), and (5) seven unnumbered visions (19:11–21:8), with the Jerusalem appendix (21:9–22:5) The book of Revelation