> I wonder if optical illusions work when we're picturing things in our head. I want to say that some won't work, since I know there are some that rely on desi

> I wonder if optical illusions work when we're picturing things in our head. I want to say that some won't work, since I know there are some that rely on design flaws in our eyeballs (placement of the optic nerve). I'm thinking specifically about the ones where you are directed to look at some part of the figure and notice that some other part has vanished.