Shape Rule
[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”]
![](https://supermeter.social/index.php/media/cache/resolve/entry_thumb/c3/4f/c34fb60446652ea4dfbd1eed22ec9b013c14c86390709045c1ecf11ab719514b.jpg)