R.M. Sainsbury, "Two Ways to Smoke a Cigarette"

Most cases of purported hidden ambiguity can be handled by recognizing that meaning is "unspecific"--that the meaning of a sentence is compatible with a wide range of different states of affairs making it true. In a case like Travis's "The leaves are green", the leaves are green so long as there is some surface that is green; the feeling that one of the utterances is false is the result of our normal expectations about the way the sentence is made true being subverted.