Full Idea
The epistemic view is that ignorance is the real essence of the phenomenon ostensively identified as vagueness. ...[203] According to the epistemic view, I am either thin or not thin, ...and we have no idea how to find out out which.
Gist of Idea
The epistemic view says that the essence of vagueness is ignorance
Source
Timothy Williamson (Vagueness [1994], 7.4)
Book Reference
Williamson,Timothy: 'Vagueness' [Routledge 1996], p.202
A Reaction
Presumably this implies that there is often a real border (of which we may be ignorant), but it doesn't seem to rule out cases where there just is no border. Where does the east Atlantic meet the west Atlantic?