The dung beetle

Day after day the dung beetle goes out in search of dung, collects it and rolls it from one pile to another.  One day an unexpected mountain blocks it's path. It is unable to climb over the mountain so it is forced to find another path.  I move my foot and the mountain is gone.  The dung beetle stops, perhaps perplexed by the appearance and disappearance of mountains, recalibrates it's trajectory and then resumes it's dung collection.  Mountains are only mountains depending on perspective.