This is exactly where the article ends: So what if, Glynn proposes, a scene in a movie added, subtly, light in a very specific wavelength of green? Then just k

This is exactly where the article ends: So what if, Glynn proposes, a scene in a movie added, subtly, light in a very specific wavelength of green? Then just kept ramping up, more and more green—and, at a key moment, the screen dropped all the green out at once. The movie would induce the complementary color as an afterimage. You'd imagine you were seeing a specific red, not projected on the screen but as a neurophysiological response to stimulus. And if you pick the precise wavelength, “you could actually cause someone to perceive a color that they could never otherwise see. Like, there's no natural way for you to have the perception of that color.” That color wouldn't be onscreen. It wouldn't be anything a projector could cast or a computer could generate. It'd be a function of pure cognition, different for every viewer, existing only in the mind, then fading to nothingness. Which is true for all colors anyway, when you think about it.