The professional partnership by Achille Castiglioni, Livio Castiglioni and Pier Giacomo Castiglioni has been called the "Castiglioni brothers", which Livio left in 1952. This group has become one of the most witty, elegant and innovative partnerships in modern design. The brothers worked from the viewpoint that design must restructure an object's function, form and production process, and applied this maxim to every work that they produced. Castiglioni described this process with these words: "Start from scratch. Stick to common sense. Know your goals and means".