I'd say both. Anything that makes you feel something could be called art, and I'm of the opinion that experiencing emotions without personal investment is therapeutic through images, music, or writing. From a writers perspective though putting my thoughts on paper is therapy, but it's not art. The chance readers who find my thoughts and emotions and relate to them in their own unique way is what makes it art to me, two hearts feeling the same pain without any inside knowledge of the other. It's a beautiful thing if you ask me.