The object
Mario Bellini designed Olivetti’s Divisumma 18 electronic printing calculator, combining compact electronics with a distinctive yellow synthetic-rubber skin and tactile keys. MoMA describes the device as enormously popular and preserves it in the design collection.
01
What Mario did
designed Olivetti’s Divisumma 18 electronic printing calculator and its moulded tactile rubber interface
02
Why it matters
MoMA identifies Divisumma 18 as an enormously popular portable alternative to earlier cabinet-sized calculating machinery.
03
Living-status check
The Steve Jobs Archive published a dated first-person letter from Bellini in its August 2025 Letters to a Young Creator collection.