What I've been thinking for years is that; is there a box actually? Or are there unlimited boxes one inside an other? One may think of something standing outside the box and still he's inside an other box.
Developing the idea, there are unlimited boxes sorrouoding any considering subject. Just as an onion. Anything has onion type layers which one can think of it standing on.
And that came from shrek. Remember the ogre which had layers?