Outside In (1994) — animation, documentary film. Directed by Delle Maxwell, Silvio Levy. Starring Karen McNenny, Paul de Cordova.
Animation, Documentary · 8/10 · 22 min · 1994
The computer animation Outside In explains the amazing discovery, made by Steve Smale in 1957, that a sphere can be turned inside out by means of smooth motions and self-intersections. Through a combination of dialogue and exposition accessible to anyone who has some interest in mathematics, Outside In builds up to the grand finale: Bill Thurston's "corrugations" method of turning the sphere inside out.
Related entry on Wikidata (Q111822573), public domain (CC0).