For documenta VI (1977), Serra designed Terminal, four 41-foot-tall trapezoids that form a tower, situated in front of the main exhibition venue. After long negotiations, accompanied by violent protests, Terminal was purchased by the city of Bochum and finally installed at the city's train station in 1979. Carnegie (1984–85), a 39-foot-high vertical shaft outside the Carnegie Museum of Art in Pittsburgh, received high praise. Similar sculptures, like Fulcrum (1987), Axis (1989), and Torque (1992), were later installed in London's Broadgate, at Kunsthalle Bielefeld, and at Saarland University, respectively. Initially located in the French town of Puteaux, Slat (1985) consists of five steel plates - four trapezoidal and one rectangular - each one roughly 12 feet wide and 40 feet tall, that lean on one another to form a tall, angular tepee. Already in 1989 vandalism and graffiti prompted that town's mayor to remove it, and only in December 2008, after almost 20 years in storage, Slat was re-anchored in La Défense. Because of its weight, officials chose to ground it in a traffic island behind the Grande Arche.