Thinking back to when Aphex Twin encoded his face into a track: https://www.bastwood.com/?page_id=10
I did silly things like this as teenager too. Always thought it would be a nice way to hide secret messages on an open signal.
Reminded me of this video covering his use of Metasynth and other obscure software in early tracks on yt https://youtu.be/5wIOBBodoic
Mick Gordon hid satanic symbols in the DOOM 2016 soundtrack.
And Venetian Snares encoded his cat https://eeggs.com/items/46956.html