Elsewhere

Most people think of time as a track that they run on from birth to death as inexorably as a train follows its rails—they feel instinctively that time follows a straight line, the past lying behind, the future lying in front. Now I have reason to believe—to know—that time is analogous to a surface rather than a line, and a rolling hilly surface at that. Think of this track we follow over the surface of time as a winding road cut through hills. Every little way the road branches and the branches follow side canyons. At these branches the crucial decisions of your life take place. You can turn right or left into entirely different futures. Occasionally there is a switchback where one can scramble up or down a bank and skip over a few thousand or million years—if you don’t have your eyes so fixed on the road that you miss the short cut.