I think I've understood your example. I'm just not sure how important it is. We have things such as optical illusions already. Does this have a material effect

I think I've understood your example. I'm just not sure how important it is. We have things such as optical illusions already. Does this have a material effect on the structure of the universe? On objects in the universe? Or is it just causing mathematical paradoxes? I've played around with the fantastic idea of instant portals between places (or simple teleportation), and assume this would have unusual effects on gravity when, for instance, portalling from one side of a planet to the other. I think I lack the theoretical basis to really understand whether this is a problem for the universe as it is. And I don't think a lay explanation can be satisfactory. I appreciate your attempt.