At the Paris Exposition Universelle in 1900 she appeared in her own theater. Her later experiments in stage lighting, a field in which her influence was deeper and more lasting than in choreography, included the use of phosphorescent materials and silhouette techniques. During World War I she entertained Allied troops and engaged in relief work for which she was later decorated by several nations. In 1926 she last visited the United States, in company with her friend, Queen Marie of Rumania. She died in Paris on January 1, 1928.
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