Heidegger addresses the case of being in three different senses. Firstly, as beings or entities, which he understands as that which "is' in the sense of that which is present. Secondly, as the being of entities, which is the mode of being of entities, whether as essentia or existentia. In the period following Being and Time Heidegger adds a third sense to the two senses of the ontological difference; namely, being as "">Seyn". Seyn indicates Being itself—that is to say, Being at large—which what he calls "essences' and "presences' entities by letting them arrive in their specific mode of being, having itself, however, an absent and rather concealed character.