The british painter David Hockney speaks out on the power of the image in things like the Egyptian revolution. How things like cell phones can expand the range of witnesses to history, and thereby affect it. Hockney talks about how at one time the Church had a monopoly on the creation and distribution of images. All one saw was "Heaven Hell, and Martyrdom". Now media, like this very blog, are in public, not church -- or corporate -- hands. Hockney, who is now 73, makes good points in this article.