Comments by "XSportSeeker" (@XSpImmaLion) on "Can You Recover Sound From Images?" video.

Awesome... I remember watching videos or reading about this sometime ago, but it never went into much detail in some cases, and in others it was waaaaay overblown. Like, you could have people surreptiously listening to stuff with their smartphone cameras or something. Which I knew was highly unlikely. But yeah, super interesting, and it does make sense.
1