I think this is interesting, the big question about outside the box. I can handle thinking about the color one easier than the music one. A world with 4 primary colors I can conceive of, can't think of a way to fit a 4th in there but yeah I can conceive it. But a note that isn't inside that doubling frequencies thing is beyond what I can conceive. Maybe if you approached the physics from a different way. Hell I don't know but it's interesting to think about. Ponder ponder ponder ponder ponder ...... LOL