This exhibit is not for the faint-hearted. Matisse: Radical Invention, 1913–1917 showcases the paintings and sculptures Matisse created during the most radically inventive period of his career. You can clearly see his work process and follow his struggle as he uncovers the essential forms and colors for his compositions, some quite ambitious. Pretty? No. Dramatic and overpowering? Yes. The exhibit is at the Chicago Institute of Art until June 20.