I don&#x27;t see how your example leads to a contradiction. If 1 and 2 hold, and no person considers Sally to have more than one color hair, this seems fine.<p>&gt;There is a box in a room that is painted yellow. A group of people is asked to state the color of the box but they are all colorblind and state that it is grey. The consensus about the color of the box is clearly wrong in this case.<p>My proposal doesn&#x27;t depend on people actually being asked. It&#x27;s more of &quot;what would people say, if they were asked, and given all relevant objective information&quot;. Your scenario is ruled out.