Prix compasso d'oro pour Small child's chair, “K 1340” (1964) Low-density polyethylene Marco Zanuso in collaboration with Richard Sapper Kartell, Noviglio, Milan. The stackable chair came in orange, green, and white. Its molded seat and back, with openings to make it lighter, were one entire piece. The legs fit into the bottom of the seat individually. This chair marked the beginning of chairs made completely in polyethylene.