Clean bottle
Many of us do not know what they tell or how to describe them mathematically.
A clean bottle is an object that has no inside and no outside. It is a fixed shape where if you walk through the starting point of a surface, you will never cross one end, and will return to the original place. It is an object of 1 dimension with no edges.
This photo shows how to make a clean bottle
Clean bottle is a surface shape that cannot be made in 3D. It may just look like a closed bottle but you cannot drink water from it. All the water will fall from it.
This is a beautiful picture of a clean bottle. Makes a surprise.
Thank you for reading.
Images: Google image