The Ecole normale supérieure is one of a few schools that still occupy a campus in the heart of Paris. The historic Paris ENS campus is located around the rue d'Ulm, the main building being at 45 rue d'Ulm in the 5th "arrondissement" of Paris, which was built by architect Alphonse de Gisors and given to ENS by law in 1841. Above the entrance door are sculptures of two female figures who respectively represent letters and sciences. They are portrayed sitting on either side of a medallion of Minerva, who represents wisdom. A formalised version of this frontal piece is used as the school's emblem.