Light is meaningful only in relation to darkness and truth presupposes error. It is these mingled opposites which people our life which make it pungent intoxicating. We only exist in terms of this conflict in the zone where black and white clash.
It's not only imagination it's the distortion of the vision. You suddenly think This person is idealistic this person is strong this person has dreams when you know better most of the time. You put what you want to see on people.