I began pushing my boulder up the hill long ago. Just when it started getting easier, I tripped, stumbled and fell to the ground. My boulder paused, then started backward. My boulder ran me over and flattened me into the ground. It continued to roll. My boulder reached where I had begun and then beyond. It came to rest in a giant canyon. I lay there stunned for a brief moment. I crawled all the way to my boulder. I stood up and began to push again.