As Ichabod Crane is riding away from Sleepy Hollow to get away from it all, he takes out the two sided stringed circle that he likes to spin around. (There's a bird on one side, and a cage on the other. When he spins it on the strings rapidly, it creates the illusion that the bird is sitting inside the cage, even though they are on opposite sides of the circle.) As he spins it, we see him from the front, and we see the bird in the cage RIGHT-SIDE UP. Then the camera cuts from behind his shoulder and we see the bird in the cage, Right-Side Up AGAIN! If this were reality, at one of the two view-points we would see the bird in the cage UPSIDE DOWN, and at the other view-point it would be right side up. Try it at home- you'll see what I mean.