Director: Raymond Bernard
Production Design: Lucien Carré / Jean Perrier
After Walter Percy Day returned to England art director Jean Perrier, who had Per Day several times painting on his films, started to use those tricks on his own way. I cannot be sure if he executed the paintings himself or if he just designed the trick shots and had some scenic artist for the paintings.
Three glass shots.
That ceiling looks like a foreground miniature but it could be also a glass shot.
Miniatures were used very often on French films during those early years.