In the Stanford Encyclopedia the predicate "is on Mt. Everest" is given as an example of the sorites paradox applied to a physical object--where does Everest end and another geological formation begin? It seems to me that people who climb Mt. Everest (including Sherpas who live in the area) know that the base camp is where Everest begins. The millimeter objection in the article seems arbitrary. Why not an operational definition of "being on Everest is at or higher than the base camp used to reach the summit"? I have no problem accepting that as fact. Likewise, if I describe something as a "heap", and the person I'm communicating with recognizes it as such, what difference does it make how many units are in it?