Sesame Street has featured some surprising musical guests since its debut in 1969 (has any other show ever included a singing appearance by Ralph Nader?), but we were the wrong age (too old to be children, too young to have children) during its foray into minimalist, avant-garde music videos. Written in 1979, when Philip Glass was still relatively little-known and cutting-edge, the pieces, called “Geometry of Circles,” paired gorgeously animated geometric shapes with his entrancing music. And Glass makes sense for Sesame Street: What child doesn’t like bright colors and strangely calming, repetitive music?

Now you can see “Geometry of Circles” on YouTube (of course) in an extended format that combines the four available clips into one. Glass is one of the few living “serious” composers most people in Generation X recognize — and this clip will show you why: He started courting this audience when it was in diapers.

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