What pictures do you have for your memories? You think or feel back to somewhere in your life's past and it comes along with an "image" that you see in front of your mind's eye.
Are these pictures focussed, do they have details, are they just vague "thumbnails" to mark an impression that is not just image but a complex set of sound, image, thought and feeling?

I think we all have a massive private image stock. Nobody else will ever see them, and we can't share them either. (Unless we elaborate to describe them in words of produce a drawing or a painting). How do they interact with the things that we actually, really see in our daily lives? Do they get super-imposed?