The obvious truth you think ain't cuz the writer knew you would understand what the real dimensions against reality we live in are without your inability to perceive them.
It's not difficult. You can see it. Let me throw an example of one them.
We see 4 dimensions. Height, width, Length and time right?
There's another multidimensional track here. This is the Story. It's a little more complicated and I'd be foolish to claim understanding of that; though I would easily say the I know a few of them. I've read many Sci-Fi, Fantasy and a few others.
That's just an example. I am trying to give you understanding but if you continue to ask questions that are essentially a weapon using ignorance to attempt to smear someone who is attempting to help everyone before the Sun smite gorram planet like Mars for our universal suicide in ways we can't begin to understand let alone describe should we actually know anything about it let alone understand anything.