The Arco lamp was designed by Achille Castiglioni and Pier Giacomo Castiglionii for Flos in 1962. The Arco lamp is a floor lamp which provides direct light and satisfies the request of direct illumination without the need to fix it to the ceiling. Most rooms have the electrical output for a ceiling lamp right in the middle of the ceiling, but most dining tables are not placed in the middle of a room. Achille Castiglioni was unhappy because of the cable going from the output to the position where the pendant lamp is fixed to illuminate the table. For this reason he designed the Arco lamp, together with Pier Giacomo Castiglioni.