The Importance of Spacetime Dilation

I heard the claim being float around that there was this vehicle that was small in size, and you went inside it and it was gigantic. And I suppose that could be some form of spacetime dilation. Who knows, but that spun me a little bit because then I started thinking, what's to say we're not inside one of these things? What's to say if they're capable of that, then we're in some kind of egg? The pre-urequisite is no one's coming to you and giving this to you until you ask for it. You have to not just ask, you have to really want it. And then you get it. This is in the