Remark 4: The same difficulties also appear with plurals, as we can see if we replace gold by pieces of furniture and in the safe by made by John in the examples above. There is no agreement on what the proper treatment of negated plural sentences is. Still, a popular view is the following (Krifka 1996; Löbner 2000; see Breheny 2005 a contrario). Sentences like The pieces of furniture are in the safe and The pieces of furniture are not in the safe make a presupposition of “indivisibility”: they can be used felicitously only if all the pieces of furniture are in safe or if none  is.[15] The same could be proposed concerning mass nouns. In any case, a unified treatment of negation would be welcome, given that negation seems to create the same basic problem with mass nouns and with plurals.