Contra what Kirsch implies, when Heidegger writes about earth he isn't referring to, you know, physical stuff per se — not rocks, or trees, or door-latches. Instead, he's referring to the tendency of things to resist our ability to understand, or even to notice, them. There's a whole realm of the unknown and not-understood out there, and it surrounds and contains us, even makes up a great deal of our physical self and our psyche, and this is what Heidegger has in mind when he writes about the earth (yeah, I know, it's an odd term, but it plays into a whole series of extended metaphors in Heidegger's writings, so let's let it slide).Last month we noted that at the time of "The Origin of the Work of Art" (1935) the elements of the fourfold were still in play.