The words "white space" mean different things to different people. To an artist, it signifies the unmarked areas on a canvas. To a radio broadcaster, it means an open frequency. As a father, it can mean something altogether different.
Recently, I had the privilege of hearing Juliet Funt speak. Even though she doesn't live in a van down by the river, she manages to be an effective motivational speaker. One of the things she talked about that hit home with me was making sure that there is plenty "white space," or unplanned time in your day.