![](https://image.tmdb.org/t/p/w500/woiKwLqhe4JekSxkNYWkfj88Zqb.jpg)
Outside In
May 15, 1995
22m
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.