It's called alternate realities. I think alternate realities are a bunch of fun. As I understand it, an alternate reality could, theoretically, be created when there is a choice. Like right now I could choose to post this, or I could choose not to. And as I understand alternate realities, it's like the timeline splits. The timeline that's led up to this moment splits in two. In one reality I do post all this crap. In one, I don't. It can all get really complicated if you add in all the choices being made in the universe. I wonder, how could this exist? Would a choice create like a duplicate universe? And how could the timeline split simultaneously? Would two simulataneous choices produce four separate realities? And most importantly, to me, assuming alternate realities exist, how could one travel between. How could one leave one reality and enter another? And to expand on that, what effects would it have to travel between realities? Would you cease to exist, would you become whatever representation of you there is in the new reality? That's cake for thought.