Fascinating! Buber's idea that in the genuine I-Thou relation, the Thou is no longer just a part of the larger world but "fills the entire picture" on its own unique terms is indeed different from Heidegger's openness to the "Lichtung", where beings emerging from the potentiality of the unnamable "Sein". But Buber seems akin to Rilke's poetic encounter with the sensuous presence of one particular thing in the actual world, even though Rilke also seems to assume an underlying (un-)ground akin to Heidegger's "Sein" .