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I went to an automation conference at Google in 2013. There is a European steaming set top box software company that uses webdriver and an image recognition library to validate their encoder and upload works properly. Before they used a more complex image to validate but then switched to a very flat white and red box to make it easy for the image recognition to validate. These videos are it.
When I was a kid, many years ago, I had a portable radio that picked up some shortwave radio numbers stations. I noticed that by placing my hands adjacent to the antenna, I could modulate the sounds of a numbers station broadcast much in the way a Theremin is played. This became the basis for a lot of low budget teenage experimental music.