The Wobbulator is a black and white CRT television that has additional hardware to manipulate the electrons as they bombard the phosphor layer of the screen. It was created by June Paik in the 1970’s.
The Wobbulator permits a wide variety of treatments to be performed on video images via extra yokes and by the application of signals derived from audio or function generators on the yokes. Basically, what you get is a visual representation of the sound being fed into it – visualizations circa 1970.
Just check out the video, it’s worth the watch.