Which French artist designed ballet sets for Sergei Diaghilev?

Henri Émile Benoît Matisse (F31 December 1869 – 3 November 1954) was a French artist, known for both his use of colour and his fluid and original draughtsmanship. He was a draughtsman, printmaker, and sculptor, but is known primarily as a painter. Matisse is commonly regarded, along with Pablo Picasso, as one of the artists who best helped to define the revolutionary developments in the visual arts throughout the opening decades of the twentieth century, responsible for significant developments in painting and sculpture.

Diagnosed with abdominal cancer in 1941, Matisse underwent surgery that left him chair- and bedbound. Painting and sculpture had become physical challenges, so he turned to a new type of medium. With the help of his assistants, he began creating cut paper collages, or decoupage. He would cut sheets of paper, pre-painted with gouache by his assistants, into shapes of varying colours and sizes, and arrange them to form lively compositions.

Matisse's first recorded use of the technique was in 1919 during the design of decor for the Le chant du rossignol, an opera composed by Igor Stravinsky. Albert C. Barnes arranged for cardboard templates to be made of the unusual dimensions of the walls onto which Matisse, in his studio in Nice, fixed the composition of painted paper shapes. Another group of cut-outs were made between 1937 and 1938, while Matisse was working on the stage sets and costumes for Sergei Diaghilev's Ballets Russes.