A most remarkable instance of this was afforded in the play of Camille by the performance of the supper-scene. The stage in this scene is supposed to represent a supper-room, enlivened by the presence of a party of young Parisians, more gay, indeed, than respectable, but still Parisians, and Parisians of the demimonde, which, of the two halves that go to make up the whole of the monde, preserves the hemisphere of manners while it throws away the hemisphere of decorum.
Source: wiktionary