Turning a Sphere Inside Out

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About Turning a Sphere Inside Out

“Unfolding the impossible: turning a sphere inside out, without a single crease.”

This video is about the problem of turning a sphere inside out, by passing the surface through itself, without making any holes or creases. Mathematicians believed the problem to be unsolvable until 1958, when Stephen Smale proved otherwise. The motion of turning a sphere inside out, called a regular homotopy, is extremely difficult to visualize. The homotopy in this film was developed by Bernard Morin, a blind mathematician. The motion is illustrated with a sequence of chicken-wire models, built by Charles Pugh, showing the crucial stages in the motion. Commentary is provided by mathematicians Nelson L. Max, Stephen Smale, and Charles Pugh, and by physicist Judith Bregmann. Running 22 minutes.

Turning a Sphere Inside Out Cast and Characters

The cast features Nelson Max (as Self), Stephen Smale (as Self), Charles Pugh (as Self), and Judith Bregman (as Self). Their performances are a major reason Turning a Sphere Inside Out has built such a passionate audience.

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Why People Are Watching Turning a Sphere Inside Out

Turning a Sphere Inside Out flies under the radar but it deserves your attention. What makes it work is a tone and style that's hard to find elsewhere. If you enjoy English storytelling that doesn't follow the same tired beats, this is the kind of film you'll end up recommending to friends.

Frequently Asked Questions about Turning a Sphere Inside Out

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