Courtesy of the Friends of the High Line website.
This picture helps illustrate one of the features of the High Line I was originally doubtful of. While the flooring changes, most of it is these long concrete panels, which are there to, I suppose, hint at the linearity of rails and be vaguely reminiscent of the sidewalk and hence the New York City fabric.
Where the flooring gives in to grassy spots, as it does with some frequency, the boards thin and rise up in a sort of wave, which is what this picture doesn't show. At first I thought it broke the unity of it, and felt quite superfluous. But because they rise up, the effect of the grass poking through is quite complete. It becomes quite wild - more so than ordinarily, as though it were coming of its own free will through borders. It feels like wild growth is possible, responsible, and also very much controlled and unthreatening.
Very well done.