Treasures of the Internet

I am fascinated by the unusual products available on the internet. Here you can buy the finest closed, non-orientable, boundary-free manifolds sold anywhere. Stuck as we are in 3-space, these are as close to true Klein bottles as we can hope for. Very nice.

I still have no explanation for this. The fact that someone sells this product suggests there is a demand for it. I don’t understand how that could be.

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