It is more about studying the universe within a framework than about going through a magic door to other universes. For example, if you take a mathematical grou

It is more about studying the universe within a framework than about going through a magic door to other universes. For example, if you take a mathematical group one thing you can do is view every group as a group of permutations. That changes the "framework" but it is equivalent to working with an alternate encoding of the group.