SelgasCano, the Madrid-based firm known for its playful buildings wrapped in polychromatic plastic, has applied its signature material to the design of this year's Serpentine Pavilion in London. The temporary structure is a steel frame clad in shimmering plastic webbing. The cocoon is formed from a double layer of ETFE, a fluorine-based membrane the firm has used in a number of projects, such as El B Auditorium and Congress Hall in Cartagena, Spain. The installation, the gallery's 15th, will be on view through mid-October. Located in Kensington Gardens, it worms across a verdant lawn near the Serpentine Gallery, housed in a former neo-Georgian tea salon.