Originally designed in 1957, perfected over the years, and produced by Bernini in 1966. Seeking to pare down the structure of a bookcase to the absolute minimum, Castiglioni decided to hang the shelves on knots in two cords fixed to a single point on the wall.
Achille Castiglioni (1918 - 2002) and Pier Giacomo (1913-1968) were born in Milan where they, together with their brother Livio (1911-1979), initiated their designing career entirely based on the research of “new” forms, techniques and materials. The aim was to attain an "integral" design process. Achille and Pier Giacomo Castiglioni are among the founders of the Industrial Design Association. Achille and Pier Giacomo Castiglioni started working for Zanotta in 1964.