In 1979, Sesame Street animator Cathryn Aison created "Geometry of Circles," an abstract animation with original music by minimalist pioneer Philip Glass. It consists of four segments that were first aired as a complete piece. From the Muppet Wiki:
The shorts consist of the movement of six circles (each with a different color of the rainbow) that are formed by and split up into various geometric patterns. Glass's music underscores the animation in a style that closely resembles the "Dance" numbers and the North Star vignettes written during the same time period as his Einstein on the Beach opera.