Painting with watercolor is like a series of chain reactions. I put a stroke down, see what it does to the image, and react to it. Back runs, bleeds and unexpected whites where the brush lost contact with the paper are all opportunities to add character and personality to a painting.
Many artists try to over control watercolor rather than reacting to its unique characteristics. It is the one medium that truly has a mind of its own, and when you choose to respond to its actions rather than trying to control them, you allow the true beauty of the medium to shine through.
I like the idea of the medium leading me through the painting process. I enjoy not knowing exactly where it will take me next.