If you follow the surface with your finger, starting from the outside, you can end up on the inside, without traversing the surface. There is only one surface, no concept of outside or inside, contrary to a good old cube for instance.

Similar to a Moebius strip but with a higher dimension. A MS is easier to understand since you can easily make one to try to run your finger on the surface and end up anywhere.

Yeah but it was written on a Möbius strip and we’re still not sure where the beginning and where the end was.

ETA: the paper https://people.eecs.berkeley.edu/~sequin/PAPERS/2013_JMA_Klein-bottles.pdf

You can understand them being eager to come back in the enshittification race, it’s their thing. When you’ve been the enshittification whiz kid, but somehow dropped down behind the competition, you might just want to come back and reclaim your #1 mug at some point.

I say, nice move, fuckers.

No such thing as a national flower for France. And if there was one it wouldn’t be the iris anyway. And many other countries don’t have that concept either.

This is some bullshit made up by an American florist trying to sell flowers to people who identify as 1/67th Slovenian.