Heidegger values poetry essentially not by means of its philosophical—that is, metaphysical—content, but solely from the perspective of the task of "thinking" Being. He ascribes an onto-eschatological relevance to the poetry of Hölderlin. As the poet of absence, Hölderlin is in a historical sense the herald of concealed Being as the mystery. Hölderlin arrives at the transitive phase of the consummation of metaphysics and points in an originary sense back to its Greek origin. His poetry has projected the German being by "throwing it back and ahead" in its widest future. Heidegger calls Hölderlin the "herald" and "caller" for the concerned ones who are placed in the vocation of being "builders' of a "new world".