Yes, dear readers, another hard-to-find video. If you have a copy, please contact me in private <grin>.

This is a piece of mathematical animation history, and was made on the glorious PDP (for the kids out there, that’s a 16-bit machine. Yep, in our days these usually work as washing machine embedded controllers….) By Nelson Max, published in 1976. It is no exhaggeration to say that generations of mathematicians learned to visualize a possible sphere eversion thanks to this video.

Unfortunately the video is out of print and worse, the masters were lost. The original Topology Film series had four films: the sphere eversion, planar homotopies of curves 1 and 2, and the Sierpinski curve.

In the early 2000, the director worked on a remake of “Outside In”, published in 2004 by A K Peters. That videotape is, as well, very hard to find. Please feel free to contact me in private if you have a copy.