The sixteen first numbers of the Fibonacci series, in blue neon, are placed on the bird exterior of the Manica Lunga wing, in proximity to the sixteen large windows that punctuate the long structure. Already uses as an art gallery by the Savoy family in the 17th century the building is brought up to date in an encounter between past and present, in which the window, a boundary between interior and exterior, takes on a primary value of relationship and interpenetration.