# Turning a Sphere Inside Out

Title from data sheet

Commentary, Nelson Max, Stephen Smale, Charles Pugh, Judith Bregman

Produced as part of the Topology films project

Intended audience: College and adult

Issued also as videorecording

Uses advanced computer animation to discuss the problem of turning a sphere inside out by passing the surface through itself without making any holes or creases. Illustrates the homotopy with a sequence of models, showing the crucial stages in the motion

- Kind: Educational
- Year: 1976
- Runtime: 22 min
- By: Education Development Center, International Film Bureau
- Genres: Education, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/turningasphereinsideout)
- Licence or status: none stated by the archive
- Who can watch: Kids profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/turningasphereinsideout?play=1)