the balance aspect comes from their personalities. You know its funny that Michael and Liz are referred to as polar, because when you break it down they really are omre a like than anyone realizes. Surface, smart, pretty schoolgirl and the thumb his nose at authority reclusive bad boy. Classic right? Except that Michael has this incredible intelligence about him and Liz isn't as pure as we've been led to believe. AND Its like they come to each other on equal footing with more in common than ether of them would think.
I could not have said that any better.... Everything I think is in there.. lol..thanks Peachykin