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Full Idea
Things are similar to the extent that they are interchangeable parts of the cosmic machine.
Gist of Idea
Similarity is just interchangeability in the cosmic machine
Source
Willard Quine (Natural Kinds [1969], p.134)
Book Ref
Quine,Willard: 'Ontological Relativity and Other Essays' [Columbia 1969], p.134
A Reaction
This is a major idea for Quine, because it is a means to gradually eliminate the fuzzy ideas of 'resemblance' or 'similarity' or 'natural kind' from science. I love it! Two tigers are same insofar as they are substitutable.
Related Idea
Idea 16948 Once we know the mechanism of a disposition, we can eliminate 'similarity' [Quine]
| 191 | Everything resembles everything else up to a point [Plato] |
| 17712 | General ideas are the connection by resemblance to some particular [Hume] |
| 8544 | Hume does not distinguish real resemblances among degrees of resemblance [Shoemaker on Hume] |
| 2210 | A picture of a friend strengthens our idea of him, by resemblance [Hume] |
| 15755 | Hume needs a notion which includes degrees of resemblance [Shoemaker on Hume] |
| 9081 | We don't recognise comparisons by something in our minds; the concepts result from the comparisons [Mill] |
| 5410 | I learn the universal 'resemblance' by seeing two shades of green, and their contrast with red [Russell] |
| 16934 | General terms depend on similarities among things [Quine] |
| 16938 | To learn yellow by observation, must we be told to look at the colour? [Quine] |
| 8486 | Standards of similarity are innate, and the spacing of qualities such as colours can be mapped [Quine] |
| 16947 | Similarity is just interchangeability in the cosmic machine [Quine] |
| 12661 | The different types of resemblance don't resemble one another [Fodor] |