While observing street lights, for instance, he was inspired to design the world famous gooseneck lamp Arco
. Castiglioni recognised that these lights in contrast to the then wide spread floor lamps were able to illuminate an area of several metres. These observations form the basis for the design of the Arco
with its elegantly curved arc and the flexibly adjustable light.
He often worked together with his brothers when making new drafts and designs – the Arco
, for instance, was created in collaboration with his brother Giacomo. This Arco
was already designed in 1962 and is up to now still one of the most popular gooseneck lights.
As an icon of modern industrial design the Arco
is now a part of the permanent exhibition of the famous Museum of Modern Art (MoMA) in New York. Two other pieces by Castiglioni that were also included in the MoMA exhibition are the Toio floor lamp
and the Parentesi pendant light
which he both designed for Flos
Furthermore, numerous works by Castiglioni were acknowledged with different awards, including the highly coveted Compasso d'Oro award which he won several times. In 2001, he was awarded an honorary doctorate from the Polytechnic University in Milan.