"Chuangtse said that he once dreamed of being a butterfly, and while he was in the dream, he felt he could flutter his wings and everything was real, but that on waking up, he realized that he was Chuangtse and Chuangtse was real. Then he thought and wondered which was really real, whether he was really Chuangtse dreaming of being a butterfly, or really a butterfly dreaming of being Chuangtse. Life, then, is really a dream, and we human beings are like travelers floating down the eternal river of time, embarking at a certain point and disembarking again at another point in order to make room for others waiting below the river to come aboard. Half of the poetry of life would be gone, if we did not feel that life was either a dream, or a voyage with transient travelers, or merely a stage in which the actors seldom realized that they were playing their parts."