How long has art therapy been around?

In the early 1900's, Carl Jung, a psychoanalyst, became interested in the uses of art expression with his clients. He encouraged his clients to draw and observed that by representing emotions as an image or artwork, he was able to understand his clients emotions more clearly. As time went on art therapy was found to be very helpful for his adult clients who had emotional difficulties. By the mid-1900's, art therapy's popularity spread to other populations, including hospitals, schools, and seniors.