Sacco Chair of 1969 at The Wood Factory

Piero Gatti (born 1940), Cesare Paolinin (born 1937) and Franco Teodoro (born 1939) 
formed their design group in Turin in 1965. 

They were influenced by current theories of "radical design" and became famous for the "Sacco" chair of 1969, produced by Zanotta out of polystyrene balls 

Sink into comfort: just like every person to whom it softly adapts, it is absolutely unique in concept.