Loss is an abstract idea. In a world of possession, there will be losses. No matter how many times one gets another thing innthe place of the thing he hast lost, the experience is always new and fresh. The lost ball can be compared to lost persons too. If a person is dead or lost forever, there is no getting back.
For a little child like the boy in the poem, "The Ball Poem", it is a fresh loss. A first sad experience that is led by his world of possession. But he is not taken aback by its floating away far from him. He stands up and decides to dive into his loss to find his happiness because he is no longer a child, he has grown up....