Let's say a magician has two magical hats you put something in the hat It comes out of the other hat. Let's call this Hats A and B.
We put a rabbit inside Hat A, came out of from Hat B and vice versa. Let's say the magician had an apprentice? A very curious one at that. He noticed the two magical hats and he knew what they did but didn't know how nor did he bother with wondering that after all the idea of wonder and mystery is where the real Magic is. One day he was staring at the hats and he wondered to himself what if I put Hat A into Hat B? Where would hat A come out from? Would it come out of himself or Hat B?