Wow! That's a crazy thought. Eye tracking tightly coupled (i.e., in a ~realtime feedback loop) with PG/ML/AI seems ... powerful, or scary, or both. Something along the lines of a computer controlled lucid dream, sprinkle in a handful of whatever the equivalent would be of blinking banner ads, product placements, or subliminal messages, etc. and my mind spirals out of control imagining how that would play out.