Philosophers of time are deeply divided on the question of what sort of ontological differences there are among the present, past and future. There are three competing theories. Presentists argue that necessarily only present objects and present experiences are real, and we conscious beings recognize this in the special "vividness" of our present experience. The dinosaurs have slipped out of existence. According to the growing-universe theory, the past and present are both real, but the future is not because the future is indeterminate or merely potential. The third and more popular theory is that there are no significant ontological differences among present, past and future because the differences are merely subjective. This view is called "eternalism" or The Radar Cinema.