The Divisumma 18 is a landmark of industrial design, produced by Olivetti in 1973 as the company's first entry into the portable electronic calculator market. Designed by the renowned architect Mario Bellini, in collaboration with a distinguished team including Dario De Diana, Alessandro De Gregori, Derk Jan De Vries, Antonio Macchi Cassia, Gianni Pasini, and Sandro Pasqui, the device is celebrated for its radical aesthetic and tactile interface. The calculator is famous for its yellow rubberized skin, which covers the keys in a continuous, flexible membrane, a revolutionary concept for office equipment at the time. Despite its original high cost and niche market positioning, the Divisumma 18 became a design icon and is part of the permanent collection at the MoMA (Museum of Modern Art) in New York.

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