I like to pay atention to my dreams. A few days ago when I was halfway between sleep and awake, I was watching some hypnagogic imagery. Then suddenly this box forming onto a wall came to me, clear as if was an LCD Screen. Then when the box was opened only a subtle fog was inside. 

My expectations where high and then they suddenly. That´s why I thought this could be a good example for my visual paradoxes series.