It’s like being inside the gigantic worm in The Empire Strikes Back. For a while, you can kid yourself that you’re not inside a gigantic worm, until it starts digesting you. Because the worm is “everywhere” in your field of vision, you can’t really tell the difference between it and the surface of the asteroid you think you landed on.
I really like this term "hyperobject" used to describe things you can mentally picture or think about but can't see as such. Like, for example, climate change.