I think the sphere eversion is actually not a related problem in mathematical terms. In any case, that video is part of the excellent longer film "Outside In"

I think the sphere eversion is actually not a related problem in mathematical terms. In any case, that video is part of the excellent longer film "Outside In" made at the Geometry Center in the 90s: http://www.geom.uiuc.edu/docs/outreach/oi/ http://www.geom.uiuc.edu/docs/outreach/oi/