For those of you unfamiliar with Klein bottles, here is the wikipedia page on it( Klein bottle - Wikipedia, the free encyclopedia). Basically it has no distinction between the inside and outside cause of the way it is built (don't quote me on that though. Anyways, when I read about it I didn't give a shit about it, but when I saw it I thought it would be a nice piece. So how would one go about turning this Klein bottle into a Kelin bong? pic related
No air flow, you would have to drill a hole to toke from, and than a hole inside of it for diffusion. Good luck? lol.