I unashamedly admit that this picture was my desktop for a good while, and I think it's still one of my favorites. Since I first saw it on your website, and after I finally got over the "wow" oggling stage (...which took a while), I discovered that one of the things I like most about it -after the concept- is the ground. The rock, too, but the ground first.
And that would be because it seems that the white background is fading in just as much as the ground is fading out. ...I rather hope that that makes some semblence of sense, as I honestly can't think of a better way to phrase it that doesn't involve pointing accompanied by monosyllabic noises of admiration. Both of which are nearly useless over great, grand things like the internet.