This shows the lopsidedness a bit:
OK so imagine that the hump slightly right of center (our view) is someone's head. Someone's right arm is up in Bear's head doing this and that (eyebrows, mouth and Bear's right arm via a cord). Someone's left arm is in Bear's left arm, and that's the expressive arm (with fingers that move individually). Make sense?
(I've only seen that show a few times so might not be true, but I definitely remember thinking hmm, he's lopsided, and wondering why. Didn't notice the cord.)