The following deliberations concern a causally based notion of existence. They are to a large extend stimulated by Jan Faye's writings on the one hand — mostly his monograph The reality of the future. An essay on time, causation and backward causation ([1]) — and, on the other hand, influenced by Tadeusz Kotarbińsk's paper "The Question of the Existence of the Future"([3]). I shall deliberately omit physics, e.g. the question of how causality brings about directed temporal structures.