La Bluette is one of French architect Hector Guimard's existent buildings. La Bluette is a villa built in 1899 for Prosper Grivelle, a lawyer from Paris. The house is located at 272 Rue du Pré de l'Isle, in Hermanville-sur-Mer, Calvados, Basse-Normandie, a seaside hamlet of 2,661 (at the 1999 census) in north-western France