Bet it was empty
I dunno man, I think you shoulda had a resolution. I see why ya did that, but on the other hand, it's not a real box, so the curiosity of the viewer is sorta limited. Knamean? There isn't anything in it except whatever you decided or will decide to inhabit it with, and thats totally arbitrary. It could be a Tyrannosaurus rex, or the western half of the universe, or a pencil. Doesn't really matter.
But great animation, and use of music. Ha, my girlfriend used to go to Art Institute in Atlanta, so I bet I woulda known this is a piece for a college course even if you hadn't told us. Fun to watch. Throw some edge on there, man, or you'll end up at Disney. *shudder*