Achille Castiglioni studied architecture at the Polytechnic University of Milan before he founded a design office along with his brothers Livio and Pier Giacomo. The artistic concept of the Castiglioni brothers was marked by the reduction to the essential and simple practicality. The aim of their design was to make do with as few materials as possible in the implementation. Achille Castiglioni, soon became one of the most successful and versatile industrial designer in Italy and obtained then also international reputation.
He was known to recompose existing products sometimes in a surprising way. Two of his lamps, the floor lamp Toio - one on a steel rod
mounted headlights - and the hanging lamp Parentesi, were included in the collection of the New York Museum of Modern Art.
On the occasion of the XI. Milan Triennale in 1957 they introduced their tractor seat "Mezzadro", while the designers used a commercially available tractor seat and fastened it with a wing nut on a free-swinging band steel sheet. To stabilize, they used a wooden cross, resembling a ladder rung.
The design of the Lamp Arco by Achille Castiglioni is the result of a philosophy that should leave no room for abundance. Because of their simple design with the exact geometric shape, the lamp seems almost perfectly formed.