If you saw the animation above, you saw how it started as a simple sheet of paper, that was folded into a simple cylinder. Then, that cylinder became curved and at a rather odd angle. It then turned a full 90 Degrees, and the bottom tip of the cylinder expanded into a funnel-like shape. It then overlapped the top section of the shape, causing it to seem like the cylinder went through the funnel that it was connected to. The funnel then began to expand and rise, while the top part of the cylinder's "edges" curved and began lowering until it met up with the funnel. If you poured water into the hole, it would simply run through the mid-section of the cylinder, then it would (if the water pressure was high enough) rise to the funnel, filling the funnel and the whole shape completely (The Water inside the funnel part would be surrounding the cylinder, and NOT rising out of the whole.) Those videos you see about people filling Klein Bottles: FAKE. Even if 4D did exist, the Klein Bottles they use aren't actually Klein Bottles. The ones they use are actually built far differently than the model shown above, or in other words, they are not the real Klein Bottle. This is how the Klein Bottle really does have volume.
#11 year old