This is a spectrographic bitmap by Dietrich Featherston using modified imagery from one of my GIFs. It plays the image as audio and the result is haunting and distant and beautiful.
Here’s how he explains it:
x axis - interpreted as time, with each pixel given a nominal time value
y axis - interpreted as frequency bands
pixel gamma - amplitude at time, frequency
Pretty fascinating. Dietrich also does, like, genius-level generative art and you should check him out here.