Water Cube (Beijing National Aquatics Centre) by PTW Architects, constructed to host the aquatics competitions at the 2008 Summer Olympics and Paralympics. It consists of a steel space frame, clad with cushions made up of welded ethylene tetrafluoroethylene (ETFE), produced by Vector Foiltec. The ETFE pillows allow more light and heat penetration than traditional glass, which resulted in a 30% decrease in energy costs. Images Vector Foiltec.