Pietro Derossi, Giorgio Ceretti and Riccardo Rosso formed Gruppo Strum in 1966 with the radical idea to create an “architettura strumentale” or functional architecture, a response to modernism and the International style. They lectured on their theories which ultimately influenced the Anti-Design and Radical Design movements. Part Pop Art, part radical design, their Pratone (Italian for meadow) chair resembles a piece of turf. It was originally designed in 1970 for the “Sintesis Idee 70” competition; it won. A year later, Gufram started producing the chairs. Comprising forty-two individual “blades” which are hand-finished and attached to the base, the seat weighs over 130 pounds (59 kilograms). Produced as an edition of 200, the chair presented in Different Tendencies dates from a mid-1980s production run.