A visual thinker might like AIHVHIA’s YouTube video, which shows the effects of applying audio processing to text displayed on an oscilloscope.
The audio drives the X and Y scopes, with the Y scope representing brightness, while the text is probably produced by a service like Osci-Render.
The video displays how panning, pass filters and wave folders affect the text on the oscilloscope and may provide some artistic insight or even inspiration for audio projects.
Similar effects could be achieved by displaying video on an oscilloscope, which would be just as entertaining, if not more so.
GNU Radio has also been used to generate waveforms and perform filtering on an oscilloscope.
An older computer could also drive an oscilloscope to display text or even basic images.