Standing on the Cours des Alliés, the Champs-Libres centre was designed by Christian de Portzamparc. This complex covers an area of almost 24,000 sqm. and houses three important cultural institutions: the 6-floor library, Espace des sciences (science museum) and its planetarium and the Musée de Bretagne, a museum covering 2,000 sqm. This immense centre, set in the heart of the city, was built using purple schist, concrete and glass, and combines traditional materials with a modern design.