somebody wrote:
> Of course in 4D (which is inherently more interesting than 3D), it
> becomes just a regular surface/volume, not much more interesting than
> the Moebius band or even a torus in 3D.

The interesting property is that klein's bottle can not be "oriented".
It has only one "side" like the moebius band. So it is a little bit
more strange than a torus. Though I do not know whether it is more
interesting from a mathematical point of view. (Whatever that
means ...)

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