Full Idea
To deny that there are many cats on the mat (because removal of a few hairs seems to produce a new one), we must either deny that the many are cats, or else deny that the cats are many. ...I think both alternatives lead to successful solutions.
Gist of Idea
If cats are vague, we deny that the many cats are one, or deny that the one cat is many
Source
David Lewis (Many, but almost one [1993], 'The paradox')
Book Reference
Lewis,David: 'Papers in Metaphysics and Epistemology' [CUP 1999], p.167
A Reaction
He credits the problem to Geach (and Tibbles), and says it is the same as Unger's 'problem of the many' (Idea 15536).
Related Idea
Idea 15536 We have one cloud, but many possible boundaries and aggregates for it [Lewis]