You’ve probably heard of subliminal advertising — the idea is that behaviors can be elicited by flashing extremely brief messages on a movie or TV screen. “BUY POPCORN NOW” is the canonical example, with movies containing such subconscious messaging supposedly experiencing dramatic increases in popcorn sales.
This is a companion discussion topic for the original entry at https://hackaday.com/2023/12/13/diy-tachistoscope-feeds-your-hunger-for-popcorn-and-propaganda/