[dandersch]

>It's a condition in which one type of stimulation evokes the sensation of another, as when the hearing of a sound produces the visualization of a color.

So what happens when synesthetes watch a movie that is showing blue colors, but the score that they are hearing at that time is making them see red. Do they perceive that as a dissonance?

[matsemann]

Have you seen the concept of "impossibly colors"? Maybe like those, where you present one color to one eye and one to the other, and make the brain invent something.