The path worn through the grass shows exactly where they choose to walk.  It is what they know.  They have worn it down and discovered the safe path for their feet.  It has proven to be the best route for them. Any potential obstacles are known and easily detected in this worn-down line of exposed dirt.  Stray rocks or fallen limbs become obvious.  It has taken years to open this path with nothing but continual pounding of earth with feet.  That path is not a direct route.  It bends and curves out of the straight line.  Constant, continual, conditioning of…