Art works because it appeals to certain faculties of the mind. Music depends on details of the auditory system, painting and sculpture on the visual system. Poetry and literature depend on language. ↗
Abstract painting is abstract. It confronts you. There was a reviewer a while back who wrote that my pictures didn't have any beginning or any end. He didn't mean it as a compliment, but it was. ↗
I write because I write - as anyone in the arts does. You're a painter because you feel you have no choice but to paint. You're a writer because this is what you do. ↗