Still having the desire to know, I researched the word imagination. All definitions listed referred to the brain. "1. The act of power of forming a mental image, 2. the thinking or active mind, 3. a creation of the mind." Now I am baffled. How is there no reference in Webster's dictionary to anything but the brain? For me, it's a drive and passion that comes straight from my heart. It's this burning thing that can only vanquished by creating my art. My mind only comes into play during the physical process of creating an image.
Unfortunately, I will not be able to stand by Webster on this topic. My conclusion is that creativity is a fine balance of knowing my craft, listening to what my heart is yelling, and being very much obsessed.