Bring in stuff about four dimensional beings who can pass through solid matter, and explain how they do it, scientifically.
What about the world of clear? Where the refractions of light were the only way to distinguish one thing from another? Where you can see through clear to the end of the Universe, and beyond?
Or there is the world of where you are sitting on the garage roof, sliding down, and entering a world of pipes, or another time where you go on a mission through the underworld, with the purple rock bridges and flourescent purple lava.