Made with prefabricated structure of reinforced concrete and glass walls, the edifice of the Libreville Conference Center (1977) is the constructive expression of a past, industrial and developmental time, when the country had just ceased being a colony and was still preparing for the major urban growth that would follow. Today, the growing service economy of Gabon, associated with globalization, calls for greater clarity in the definition of certain constructed signs. Therefore, the architects ( ppms . metro . siaa) propose to involve the existing edifice with a circular translucent skin, made of ultra resistance concrete slabs, a material capable of thermally protecting the construction from the heat prevailing in the region. With a diameter of 110 meters, the new building is perfectly capable of housing the entire desired program, and it also provides a new image for the Center: a perfect cylinder, loose from the ground, and almost diaphanous, given its irregular perforation.