What is your Red Rubber Ball?

I was reading one of my favorite books, Rules of the Red Rubber Ball by Kevin Carroll the other day. In the book, Carroll talks about the one thing in his life that was a constant; the one thing that he chased since he was a little kid on the playground; the thing that still inspires him today; the thing that kept him in school and brought all of his dreams true. It was (and is) his love of sports. Not just an "I watch ESPN all day" love. But, a passion for strategic play, for pushing yourself beyond your limits, for camraderie with others who are striving for the same goals.

My RRB's are: maintaining a sense of play in my work; encouaging others to be their best; and living a dynamic, purposeful life.

What is the thing that makes you most happy? What are you chasing everyday? What is your Red Rubber Ball?