"Rhythms 21" is a contemporary dance piece created by choreographer Merce Cunningham in 1981. It is known for its innovative use of movement and music, showcasing the unique relationship between the two. The performance features a series of dynamic sequences that explore rhythm and spatial awareness, emphasizing the dancers' physicality. The work is often performed with a score by John Cage, who was a frequent collaborator with Cunningham. "Rhythms 21" highlights the principles of chance and spontaneity, allowing for a fresh interpretation with each performance. This piece is a significant example of postmodern dance and its departure from traditional forms.