Small but impressive, the collection of works by Walloon (French-speaking Belgian) artists extends from the 16th century to the present. Paul Delvaux's L'Homme de la Rue (1940) is the collection's "Mona Lisa". Many other well-known, and not-so-well-known, artists from the 16th to the 21st centuries are represented, including Antoine Wiertz, Constant Meunier Félicien Rops, René Magritte, Roger Somville, and Pierre Alechinsky.