This page seems to have Dan's shape, and it calls it a squircle. http://www.pjroberts.com/sphericon/gallery.php On Wed, Apr 21, 2010 at 1:09 PM, Kimberling, Clark <ck6@evansville.edu> wrote:
Dan,
There something like that starting with a cone instead of cyliner. It's the spericon. Google gets several really nice hits, including some rollers. Robert Foote at Wabash College has turned spericons from wood - I'm pretty sure has some sphericons on his website.
A sphericon with some animation can be seen at a Gallery of Space Curves that Peter Moses and I have at http://faculty.evansville.edu/ck6/Gallery/Introduction.html
Clark Kimberling
-----Original Message----- From: math-fun-bounces@mailman.xmission.com [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Dan Asimov Sent: Wednesday, April 21, 2010 2:51 PM To: math-fun Subject: [math-fun] Trying to recall funny shape
I recently read of an odd solid shape, with I think an odd name, that has recently been defined.
It may be this:
Take a solid cylinder whose diameter equals its height, cut it in half along a square, rotate one half 90 degrees, and glue the halves back together again.
Does this shape have a name, or is there something similar that does? Apparently it has very interesting rolling behavior.
--Dan
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