[A person offering a second person a Klein bottle. The second person rejects the Klein bottle. They have a plate of regular three dimensional shapes in front of them. They have picked up a rectangular prism on their fork. In the upper left corner is the text: “No! A responsible adult says no to non-orientable shapes”]

  • throwing_handles@lemmy.world
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    1 year ago

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    You haven’t lived till you comprehended this one! If you peel this entire surface into two surfaces like 2ply toilet paper, this is also a halfway point for one way of turning a sphere inside out, depending on which surface peels which way!