Rhythmus 21 is a 1921 German absolute film directed by Hans Richter.
The film is the first installment of Richter's Film Ist Rhythm series
and is considered an early and influential film to the abstract film movement.
(B&W, approximately 3 minutes)
Hans Richter (6 April 1888 – 1 February 1976) was a German Dada painter,
graphic artist, avant-garde film producer, and art historian.