specialists Jaroff Design helping to prepare and reinstall. Artwork A mid-2010 sound installation by Stephen Vitiello was composed from bells heard throughout New York. Lauren Ross, former director of the alternative art space White Columns, was the High Line's first curator. During the construction of the second phase (between 20th and 30th Streets) several artworks were installed, including Sarah Sze's Still Life with Landscape (Model for a Habitat): a steel-and-wood sculpture near 20th and 21st Streets built as a house for fauna such as birds and butterflies. Kim Beck's Space Available was installed on the roofs of three buildings visible from the southern end. Three sculptures, resembling the armature of empty billboards and constructed like theater backdrops, looks three-dimensional from a distance. Also installed during the second phase of construction was Julianne Swartz's Digital Empathy, a work utilizing audio messages at restrooms, elevators, and water fountains. In 2012 and 2013, the Ghanaian born Nigerian artist El Anatsui's large scale sculpture "Broken Bridge ll" (at the time his largest work to date) fashioned from recycled pressed tin and broken mirrors was positioned on a wall on the west side of the street between 21st and 22nd streets, facing and sidelining the High Line. In 2016 Tony Matelli's controversial sculpture "Sleepwalker" was exhibited upon the High Line. Max Hooper Schneider's aquarium was displayed on the linear park in 2017. The next year, the High Line hosted the British sculptor Phyllida Barlow's first public commission, "Prop". History Rail line In 1847, the City of New York authorized the construction of railroad tracks along Tenth and Eleventh Avenues on Manhattan's West Side. The street-level tracks were used by the New York Central Railroad's freight trains, which shipped commodities such as coal, dairy products, and beef. For safety the railroad hired "West Side cowboys", men who rode horses and waved flags in front of the trains. However, so many accidents occurred between freight trains and other traffic that the nickname "Death Avenue" was given to Tenth and Eleventh Avenues. In 1910, one organization estimated that there had been 548 deaths and 1,574 injuries over the years along Eleventh Avenue. Public debate about the hazard began during the early 1900s. In 1929 the city, the state, and New York Central agreed on the West Side Improvement Project, conceived by New York City park commissioner Robert Moses. The project eliminated 105 street-level railroad crossings, added to Riverside