David Hockney. My WindowFor me, it's really the joy of looking out into the world and getting this positive energy It's opening up our vision, and how we look. David Hockney When David Hockney discovered the iPhone as an artistic medium, it opened up entirely new possibilities for his art. He made his first digital drawings in spring 2009, describing the morning landscape in broad lines and dazzling colours directly on a display that offered subtle hues as unmixed