When you walk on a path and it curves in front of you, bending out of sight, do you feel a little thrill or are you worried what’s to come?  There could be anything on the path, just out of sight.  A bear?  A maniac?  The path may just fall away into nothing.  What if you don’t catch  yourself in time?

That horizon can be so tantalizing, though.  Perhaps you’ll break out of the shadows of those low-hanging branches, to a suddenly sunlit prairie.  Surely those trees can’t grow any closer than that, arching completely over the path.  The tunnel will open back up just around that bend.