The following video came to my attention recently. It presents, in my view, a perfect example of the sort of world-class hexagonal education we once provided our children in that bastion of cultural exceptionalism known as the 1980s, and which seems sadly lacking from today's undoubtedly clever yet somehow less challenging children's programming:
From the Geometry of Circles article on Muppet Wiki:
"'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 (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."
I remember this stuff from my youth, It is great information and made a great impact on me at the time.