Hollow World

https://www.royalroad.com/fiction/15193/ave-xia-rem-y/chapter/2788148/chapter-336-if-all-else

 Yes, exactly. If the world is hollow, that means you can put things in it.

 If you did not want things, you wouldn't mind the world being empty and meaningless. You want things.

 Because the world is empty and meaningless, it cannot stop you. What is truly in your way? Nothing. Nothing at all. You can put anything you want there.