You step onto the iron ribbon of the High Line at Gansevoort Street and the city rearranges itself around the walkway: deliveries hum below, a distant tugboat plies the Hudson, and plantings nudge between rivets and concrete. The audio clicks on in your ear and a storyteller’s voice folds into the ambient city — not a lecture but a sequence of scenes: a railroad that once dragged freight along a deadly street, the grassroots fight to keep it from demolition, and the improbable run of design choices that turned a rusting relic into a public promenade.