north to 31st Street across the Timber Bridge, a span shaped like a Warren truss. It would terminate ato a public space within Manhattan West that ends at the west side of Ninth Avenue, directly across from Moynihan Train Hall. Attractions The park's attractions include naturalized plantings, inspired by plants which grew on the disused tracks, and views of the city and the Hudson River. The pebble-dash concrete walkways swell and constrict, swing from side to side, and divide into concrete tines which meld the hardscape with plantings embedded in railroad-gravel mulch. "By opening the paving, we allow the plants to bleed through," said landscape architect James Corner, "almost as if the plants were colonizing the paved areas. There's a sort of blending or bleeding or suturing between the hard paving, the surface for people to stroll on, and the planting ... " Stretches of track and ties recall the High Line's former use, and portions of track are re-used for rolling lounges positioned for river views. The 120-species plant palette, curated by Dutch landscape architect Piet Oudolf, includes sturdy meadow plants (such as clump-forming grasses, liatris, and coneflowers) and scattered stands of sumac and smokebush and is not limited to native plants. At the Gansevoort Street end, a grove of mixed species of birch provides shade by late afternoon. Ipê timber for the built-in benches came from a managed forest certified by the Forest Stewardship Council to ensure sustainability and the conservation of biological diversity, water resources, and fragile ecosystems. According to James Corner Field Operations, the High Line's design "is characterized by an intimate choreography of movement." The High Line also has cultural attractions as part of a long-term plan for the park to host temporary installations and performances. Creative Time, Friends of the High Line, and the New York City Department of Parks and Recreation commissioned The River That Flows Both Ways by Spencer Finch as the inaugural art installation. The work is integrated into the window bays of the former Nabisco factory loading dock as a series of 700 purple and gray glass panes. Each color is calibrated to match the center pixel of 700 digital pictures (one taken every minute) of the Hudson River, making up an extended portrait of the river. Creative Time worked with Finch to realize his site-specific concept after he saw the rusted, disused mullions of the old factory, with metal-and-glass