Re: [math-fun] Panel puzzle

On 2015-10-24 15:49, Tom Karzes wrote:

It's called a flexatube. Martin Gardner describged it in his 1961 book, "The Second Scientific American Book of Mathematical Puzzles & Diversions: A New Selection". Here's a picture and description:

http://mathworld.wolfram.com/Flexatube.html

I have often made these out of paper, putting red dots in the centers of the panels on one side and blue dots on the other.

Tom

Vaguely related: http://www.jaapsch.net/puzzles/magic.htm It seems to be making a comeback. --rwg