Borne out of a 1971 collaboration between Achille Castiglioni and Pio Manzù, the Parentesi was named for the parenthesis symbol—a visual reference to the nickel-plated shaped tube that lives on a floor-to-ceiling steel cable. The steel cable can reach up to 157", and the tube allows the lamp head to move vertically along the cable to achieve a customized height. The head fixture is injection-molded black elastomer, equipped with a switch.