I just finally looked at the Gardner column that Tom mentioned (and that Allan Wechsler reminded me about), and I see that this object is due to Arthur Stone, even though the MathWorld page doesn't mention Stone. Jim Propp On Sat, Oct 24, 2015 at 6:49 PM, Tom Karzes <karzes@sonic.net> 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
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun