Henri Rivière's "The Progress of the Stars: Les Bergers" is a suite of eighteen color lithographs bound together to illustrate the poetic and musical works of Georges Fragerolle. The series demonstrates Rivière's mastery of the lithographic medium, employing sophisticated color techniques and delicate compositions characteristic of the Art Nouveau period. This collaborative project between artist and composer represents the symbolist movement's interest in synthesizing visual art with literature and music.