"You can see that the angular height of the fold line is considerably higher for the mountains in the background than the little strips of miraged grass -- just a few narrow patches -- closer to the camera. Apparently the field is not quite flat, so there are patches a little higher than the rest that stick up above the "vanishing line" (really, a surface that gradually slopes up away from the observer). There are even a few closer patches that present even thinner mirage images just at the fold line. Also the height of the grass is so close to the height of the fold that the mirages in the grass are restricted to a very thin strip just at the fold line; the rest of the inverted image is truncated by the tall grass. Thanks for turning this example up. I probably should make a link to it from somewhere in my mirage discussions."