Even if you walk exactly the same route each time - as with a sonnet - the events along the route cannot be imagined to be the same from day to day, as the poet's health, sight, his anticipations, moods, fears, thoughts cannot be the same.
“A duck's nest was found today near the trail on the dry open prairie with as far as could be seen no water or marsh near. The bird flew off but could not tell what species. The eggs nine originally.”