Designed by Richard Sapper the kettle 9091 in stainless steel was the first of Alessi's "designer boilers". To avoid the usual ansiogenic noise produced by the kettles, Sapper has given the 9091 a melodic whistle made of brass and consisting of two small vents in which the tuners that reproduce the notes mi and si are inserted. When steam comes out, the two tuners create a pleasant short melody. The 9091 kettle is a polysensory object which will not interrupt an enjoyable break with a whistle, but with a captivating melody.