When I lived in Paris (that sounded snooty), I made a point to try to visit every museum I possibly could. So how did I miss this!!!
Georges Fouquet's jewelry shop was designed in 1901 by Alphonse Mucha and was located at 6 rue Royale. It was later moved to the Musée Carnavalet.
I was going to try to point out some of the design elements, but it turned into a list of every component of the room. Just look at the peacocks! And the stained glass! And the tiled floor! And the...everything.
Mucha is an Art Nouveau kingpin, but he is better known for his work in advertisements. You might be familiar with some of these posters:
Fouquet and Mucha also collaborated on some spectacular jewelry: