They are Matisse's largest and most monumental sculptures.

The plaster originals are housed in the Musée Matisse in Le Cateau-Cambrésis, France.

Back (II) was rediscovered in 1955, a year after the artist’s death, and then cast.

The series have been cast in a bronze edition of twelve, including one for the artist's family.

Nine complete sets are housed in nine major museums around the world:[2]