Here’s a strange little featurette I recall seeing on TV as a kid.
Looking back on it now, I can only surmise that Dr. Seuss caught a bit of the ol’ Stanley Kubrick Syndrome floating around some circles in the early-to-mid ’70s. Unfortunately, Seuss was best at clever turns of phrase, not at 2001: A Space Odyssey.
Still, it’s sorta interesting, and it has a bizarre appeal for a kids’ film, even if it has dated rather poorly.