Bonetto was a self-taught designer with a love of jazz and playing the drums. He expressed his style in a countless number of objects, including machine tools, household appliances, alarm clocks, telephones, calculators, ski boots and surgical lasers. One of his particular fields of interest was the design of automobile interiors, where he combined the stylistic continuity of material and form with ergonomic and technical requirements. That approach contained elements of design theory as it was taught at Ulm, which are also recognisable in the Polo handle.