Question: What did both Ivan Bilibin and Mir iskusstva contribute to?
Sentence (from "Ivan Bilibin"): Ivan Yakovlevich Bilibin (Russian: Ива́н Я́ковлевич Били́бин ; ] ; 16 August [O.S. 4 August] 1876 – 7 February 1942) was a 20th-century illustrator and stage designer who took part in the "Mir iskusstva", contributed to the Ballets Russes, co-founded the Union of Russian Painters (Russian: Сою́з ру́сских худо́жников ) and from 1937 was a member of the Artists' Union of the USSR.
Relevant evidence: Yes