A camera pointed at a monitor and the image feed back on itself via a vision mixer, change various settings on the camera and mixer and this is what you could get. Interesting watching this 30 years on, we only had 1 piece of digital gear (a TBC) in the building which would not have helped us much, it was the analogue nature of the equipment that gave us such variation and control, it is impossible to achive these effects today using the same techniques, digital is just to clean! great to see it again.