Story is telling that the snail try to reach top of the Joss. After reaching to the top, there is no way to up. So that try to climb down. In our life, We don't know what the future will be, But we need to go up till we get success. But When we get success, there is nothing. But we want to know more what the future which we can't see it. The more you can't see and guess, the more you are interested.