Metaphors of Writing

Everyone has their own version of what writing is. I recently heard about a certain metaphor that really should be shared with everyone.
Writing is like dancing.
She said to me, "Writing is like dancing because you take a few minutes to get warmed up, but when you do get warmed up the words just come flying out and you just float across the page like it were a dance floor" (Shanna Goffinet).
I had never thought about this before, but she has a fantastic point. She used an active metaphor to describe the writing style. Instead of a natural occurance like a river which I used earlier, she actually used a style that is not constant. It stops when the feet are tired, or in this case, when the hands are tired.