Seeing Things is just about that. Using one's imagination and looking out the corner of your eye and even squinting a little, images can appear!
I was admiring the heavy snowfall and how it accumulated on trees and branches and originally was going to call this photo "muffin tops". But then, on second look, I saw what looked like a flock of French poodles landing on the tree in back! Click to enlarge the picture and you'll see.