Impossible is the exact right jumping off point.
I mean, who you going to believe? Me or your lying eyes? (And why just three?)
What are you to do with irrefutable evidence that what you see is not the way things really are? Do you doubt cause and effect? Or do you look for a reason why we might slur things together and come up with an incorrect and incomplete picture?
What's impossible is what makes the universe not be a warm gray mush.