The fact that beings can show up, either as meaningful in a context or as meaningless in the experience of Angst, depends on a prior phenomenon: that beings can show up at all. Heidegger calls the showing up of beings, truth, which he defines as unconcealment rather than correctness or correspondence. This ""truth of beings"", their self-revelation, involves a more fundamental kind of truth, the ""disclosure of being in which the being of beings is unconcealed."", in Greek, aletheia.