“Geometry of Circles” is a series of unnumbered animation pieces created for Sesame Street in 1979 with music by Philip Glass.

The shorts consist of the movement of six circles 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.

[muppet wiki]

How cool is that?

Very, that’s how. I bet Cbeebies isn’t commissioning any avant-garde composers to produce kind-of-scary geometry animation soundtracks for them. Which is a shame, I used to live for the animations in Sesame Street.