I got one of those Klein bottles from him, and it's really beautifully done. If you are careful, you can even store some liquid or other stuff in it. I wonder if the mathematical original could do that, too.
You're not really storing the liquid in it; you're storing the liquid on it.
True of an ordinary bottle too, which is topographically the same as a plate.
You're storing the liquid, and the rest of the universe, in it.
I suppose I am compelled to get one too. Not that I want one, it's just that I already have his books - and methinks he deserves a little extra money for this video.
It's hard for me to resist “math you can touch” :) And although it's “only” in 3 dimensions, the sheer craftsmanship is a feat in itself.
AFAIK, Chris is the only person to have blown a Klein bottle. I don't think the mass produced version is hand-blown like his original. Maybe there are a few shy chemistry equipment blowers, but not many if so.