For most levels of Super Mario Bros., you go at your own pace, and they allow you to travel backward if you wish, but a select few levels automatically scroll forward, and if you don’t actively move with the camera, the edge of the screen will push you off a ledge or crush your body against a pipe. Life is like this second style of auto scrolling, in that if you don’t continue to move forward (like if you’re ruminating about the past), you’re going to face trouble.
