Well, I'll take your word on the hyperspace thing, but sure, I suppose not. But yeah, when the ball opens up, this bright spark like lightning comes out, and then gets bigger so as to form the creature out of nothing!

[Sokka shrugs and scratches his head against that.]

The best I can figure is that there's got to be some inner lining somewhere in the metal that's used to hold the creature. But of course, the challenge is actually getting that to, you know, work.