Owl You Know?

I have a theme for my next book. It came from one of the Knock, Knock jokes hung on a tree along my daily walk to Reed College Canyon. It said:
“Knock, knock
Who’s there?
Owl
Owl who?
Owl you know if you don’t open the door?”
At first I just laughed. It’s one of those groaner jokes I like so much; good for a groan and roll of the eyes, but not particularly significant. But as I walked, I realized it was a metaphor for the vulnerability of relationships where we need to open the door to our true selves, to take a risk at knowing another or being known ourselves, or to live empty, superficial lives. So, I have my theme and my working title: Owl You Know?