Full Idea
A world may be unmanageably heterogeneous or unbearably monotonous according to how events are sorted into kinds.
Gist of Idea
A world can be full of variety or not, depending on how we sort it
Source
Nelson Goodman (Ways of Worldmaking [1978], 1.4a)
Book Reference
Goodman,Nelson: 'Ways of Worldmaking' [Hackett 1984], p.9
A Reaction
We might expect this from the man who invented 'grue', which allows you to classify things that change colour with things that don't. Could you describe a bird as 'might have been a fish', and classify it with fish? ('Projectible'?)