What are some good ways to connect our world to a parallel universe? I've only been able to find literal parallel universe information, and this question has been eating away at me for YEARS.
Well, it’s your story, so you have to find a way that is believable within its own rules.
C.S. Lewis used different objects so the Pevensies could go to Narnia, ordinary objects that hold no meaning, but, as portrayed in The Lion, the Witch and the Wardrove, are seen as a different world through the eyes of a child.
In your case, it can be anything, from a window or a mirror, the last one is very popular because of its symbolism, to a book or any other daily object, or even space travel. Burt as soon as you settle the rules of your universe you’ll find a way to connect the worlds.
Lia
