O'Regan pointed to the "exile" of apocalyptic in the modern period, and its "contemporary return" in a host of theologians, including, but not limited to: Hans Urs von Balthasar, Jurgen Moltmann, Johann Baptist Metz, Sergei Bulgakov, Karl Barth, Stanley Hauerwas, Jacques Derrida, (to a limited extent) the Pope Benedict XVI, David Bentley Hart, Catherine Keller, John D. Caputo, and Gianni Vattimo. Apocalyptic is not so exotic before, especially since we find such diverse thinkers sharing the same theological "spaces" (e.g. Balthasar, the "Pope's theologian," and Derrida, share the same space - this is surprising) O'Regan finds it helpful to map out three spaces in order to distinguish these different thinkers. He has three of them: 1) Pleromatic: maximum level of content; 2) Metaxic: in-between level of content; and 3) Kenomatic: empty of content.