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You used to be able to do this by showing certain images on a CRT. It was cool trick back in the day.

Tempest for Eliza¹ was doing the rounds some years ago. I'm sure there were other implementations in the wild, but I can't remember their names.

Yup! That's the one I remembered. On a side note, I wish they still made sites that look like that one.

this was also the way to generate audio in old trs80 games (the Model-I had terrible RF shielding).