The arrangement of steps/benches at the 10th Ave. Square seems to be one of the more successful sections of the High Line — if you judge success at least partly on the visitors’ use of and engagement with the site.
People watch the traffic with real interest, college students share snacks, couples kiss, and (perhaps a mark of a really good landscape structure) pre-teen boys find a way to engage in semi-dangerous horseplay.
Below: the windows overlook northbound 10th Ave. (Click any photo for a clearer, larger view.)
Below: at the back, the High Line walkway continues toward the Chelsea Market Passage.
Above and below: the traffic becomes really interesting when framed out as if on a screen.
Below: the blue billboard over the avenue is a work of art commissioned for the High Line.
Below: the boys were long-jumping from bench to bench.
Above and below: there’s a little tripping hazard at this turn (in the center of the photos — click to enlarge). It looks there just wasn’t enough room for the angle to run out.
Below: looking up.
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enclos*ure 
What interesting steps! It really makes you stop and think before stepping, I bet! Love that you included pre-teen boys in your description of design success!
At least no skateboards were involved. . . .