The HD Video Feedback Kinetic Sculpture makes fractals in real-time.This is an addendum to this recent video: youtu.be/zTsEeWYwKbg. Check out lightherder.blogspot.com for more info and video.
Here, one camera looks at a rotating monitor to create video feedback, and that feedback is displayed on another rotating monitor with another camera looking at it. The output of that camera is luma keyed over the original feedback. This creates fractal images.
This image is then sent to another monitor that is mixed in to yet another feedback loop by way of a half-mirrored sheet of glass.