 Another ambiguity, though perhaps best thought of as polysemy due to the similarity of the meanings, concerns count nouns like ‘(one) chicken’ and mass nouns like, say, ‘(a lot of) chicken’. David Lewis used the idea of a universal grinder (reported by Pelletier in his (1975)) to suggest that we can make sense of mass uses of substantive count nouns – apply the imaginary grinder to, say, three guitars and you can then make sense of: