&gt; It is crucially dependent on the assumption that, for any particular ‘situation’, we can unambiguously say whether or not it can be called a pumpkin, but that is the premise that it is attempting to prove.<p>No. As long as you concede that some pumpkins can be unambiguously called a pumpkin, then you just ask which is the first object on the list that can&#x27;t be.