I was astonished when I first saw the possibilities of what is called optical feedback in a presentation. I mean that you’re actually be able to create fractals without a computer, even in realtime! You just need a video camera, a monitor and a mirror.
Since I’m a software guy, I immediately thought of reproducing these effects in software. It should be possible to capture the current image of the screen and render it smaller, possibly rotated and mirrored to the same screen, thus creating a feedback loop.