Joe Colombo, who designed Triedro in 1970, inspired by and observing the lamps used by photographers of the time to control the light in the studio, combines the style of industrial design and generates an object of pure geometries, connected to each other through mechanical devices. The lampshade, made of a folded and shaped metal sheet in three parts that incorporates the luminous body, reflects the light in a way that it does not dazzle, thanks also to the use of a silver dome bulb.