Puzzle pieces

"She’s everything I’m not. She’s my other half. Without her I’m not whole. The thing about meeting your other half is, is you’re walking around, you think that you’re happy, right? You think that you’re whole, then realize you ain’t dirt without her, then you can’t go back to being just a half ‘cause now you know what it’s like to be a whole, ya know what I mean?"
-Ashton Kutcher in Guess Who

Lately I've been thinking about what makes two people compatible. . . is it two similar people who are connected through their commonalities or is it complete opposites who connect like puzzle pieces? I recently talked with a friend and asked him for his thoughts on the subject. He cited a book he read which suggested that we are best with those who are similar to ourselves. If we are similar we have less to learn about our significant other. We supposedly understand them and where they come from.
The more I think about it, marriage has many facets. One of the purposes is to become better together. Men and women are inherently different. We learn from each other because of our differences.
I used to be interested in men who had many qualities in common with me. However, lately I've realized that a man who is very different from myself brings so much more to the table. :) I have so much more to learn from a man who is so different than me.