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This elegantly curved glass bottle will make all mathematicians, physicists or science fans curious and joyful. Like the Mobius belt, it has only one side. For mathematicians, it is zero volume because it does not divide the universe into two. Despite this mathematical feature, I do not recommend filling it with water as it is difficult to dry GREAT EDUCATIONAL DECOR DECORATIONS AND Jigsaw Puzzles - It is unbound, one-sided and non-orientable. It is amazing to turn it over directly and it does not leak immediately. Immerse it in the water, see the water flowing, see it floats 😊This is difficult to do. If you want to make a small bottle, you need to add the concept of the timeline to three dimensions, which means you will reach the fourth dimension as soon as possible. How many trials and experiments we have gone through, the perfect roundness of the bottle. Heat-resistant glass, good light transmission, bright colour, resistance to sudden temperature fluctuations of approx. 200 degrees We use good packaging to ensure that it arrives in good condition. Of course, if you receive it damaged, we offer an unconditional refund (so far there has been no damage). If you have any questions when shopping, please contact us, we will try our best to provide you with quality service