A geometric compass that makes squares
Thanks to literature, fantasy and sci-fi, we have learned that ordinary objects that we take for granted also exist in parallel universes, where they work differently. For example, directions reverse, scissors cut waves, or geometric compasses draw squares. This is rather cool.
The reality is that there are objects that do not exist in our world. People can draw a square with the help of a compass but not literally with it. Let’s imagine that this is the door to a parallel universe. It would be a very crazy idea.