The Carre Rive Gauche, bounded by the quai Voltaire, the boulevard St-Germain, and the rues du Bac and des Sts-Pares, is something of a museum of ancient Egyptian, Chinese, pre-Columbian, African, and Polynesian art, as well as Louis XV, Second Empire, Art Nouveau, and Art Deco.
None of Art Deco's art has been seen in person, meaning everyone is simply guessing how it'd look.