I think this would have been shown in a primary in school in Scotland around 1977-1980 (but possibly England 1980-1983).
It was animated, I think, and shown under the guise of science education, and possibly demonstrated some theory of relativity or gravity? Parts were something like a castle with lots of staircases which went turned and went up and down in ways that didn't make sense. Things seemed to move up and down without gravity, on the underside of the staircases for example.
I was mesmerised and have been trying to remember what it was for years. Anyone else remember anything similar? Anyone?