of mind.”21 Therefore, “[w]e can no longer dismiss the change of Models as a simple progress from error to truth. No Model is a catalogue of ultimate realities, and none is a mere fantasy. Each is a serious attempt to get in all the phenomena known at a given period … But also, no less surely, each reflects the prevalent psychology of an age almost as much as it reflects the state of that age’s knowledge.”22 Lewis believed that our own model of the universe will be replaced eventually by a new one