Among other things, Tor Olav Kristensen wrote:

>> The white bands in that image. A Mobius strip is a ribbon loop with a
>> half twist, giving it one side.
>> 
>> http://mathworld.wolfram.com/MoebiusStrip.html
> 
> I was a bit surprised that you referred to them as
> Moebius strips.
> 
> But then I saw that the Mathworld page you gave a
> link to above mentions this specifically:
> 

> number of half-twists ... "



a definite inside and outside (when in the surface of the torus).

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