This is a Klein bottle wine bottle, which, although in four dimensions it shouldn't be able to hold any fluid at all, it's perfectly capable of doing so because our universe has only three spatial dimensions.
Ovo je Klein boca (Klein-bottle) – vinska boca (wine bottle), koja, iako u četiri dimenzije ne bi smjela moći imati u sebi bilo kakvu tekućinu, bez problema to može zato što naš univerzum ima samo tri prostorne dimenzije.