We never know what thing can be used for what purpose until we explore it in many dimensions, in a variety of different ways and manners. Just like a person can show multiple personality like one mask over another and so on, similarly every single things has its multiple purposes of existence. The only requirement is we need to wake up a good manipulator, a researcher a keen observer and a explorer within us that will give us a wide perspective of existence of things in relation to environment and to ourselves and vice-a-versa.