A little boy found a hole, and as he climbed and explored in the hole, he had numerous interesting discoveries. He found that there were various holes in the world, straight or curved, big or small, deep or shallow.... If you went on to compare, you would discover more, for example, you would make a hole into a pitfall for animals by setting a trap, while you would make the same hole into a warm home for them by leaving hay and leaves.... And, there were also invisible holes, which only existed in your heart....