“Big Air Package, Project for Gasometer Oberhausen, Germany” was conceived in 2010 by Christo and is on view from March 16 to December 30, 2013. The sculpture, which is installed inside the former gas tank, was made from 20,350 square meters of semitransparent polyester fabric and 4,500 meters of rope. The inflated envelope is more than 90 meters high and 50 meters in diameter. It has a total weight of 5.3 tons and a volume of 177,000 cubic meters.