In this clip from the “Earth is Change” episode of the great PBS kids science series, 3-2-1 Contact, at just before the five minute mark, you can see Al Jarnow’s profound—and somewhat haunting—“Cosmic Clock” animation.

Jarnow also did animations for Sesame Street and The Electric Company. A DVD of Jarnow’s complete short films made for PBS and The Children’s Television Workshop, as well as his experimental animation work, is available through the Numero Group.
 

 
(via Kottke)