A little boy once saw a caterpillar in his garden. From that day, he started observing the changes it goes through each day. He saw the caterpillar eat leaves, get plumper, and finally one day it hangs upside down from a leaf. It forms a shiny cocoon around itself. The boy was surprised at the changes that the caterpillar was going through. He spoke to his father one day and asked him, "Dad, why has the happy leaf-eating caterpillar turned to this cocoon? I see it must be struggling.