Inaugurated in 1976, the Aix-en-Provence Architectural Center, classified as a Historic Monument in 2013, is the core of Victor Vasarely's plastic and scientific project. At the heart of a lumino-kinetic building, 16 hexagonal modules present 44 monumental architectural integrations whose common thread is optical art. These works are the fruit of a fruitful collaboration between the visual artist, architects and companies, with the aim of creating the “polychrome city of happiness”.