Someone says to me, 'Sit down on that stool,' and I sit down on
the thing he points to. His meaning is not ambiguous; I understand what he
is referring to. But I find the term 'stool' vague under the circumstances,
and I protest, 'But this is not a stool,' for it has a little back to it,
and so it is a chair. He may reply, 'But there is really not enough back
there to call it a 'back,' so I call it a 'stool'.'
