No. 27 Category Errors
Composition
In Turkish: Bütünleme Safsatası
The parts are lovely, so the whole is lovely. Look in the pot.
Fish is lovely, baklava is lovely. Put both in one pot and it’s twice as lovely.
Solid logic! I’ll fetch the watermelon!
Lovely one by one doesn’t mean lovely together, Fadime. Even the dog won’t eat this.
What is it?
Carrying a property of the parts over to the whole: if every part is light the whole is light, if every player is good the team is good, if every ingredient is tasty the dish is tasty. Sometimes true, usually not; a whole is something other than the sum of its parts.
The pattern
- Every part of A has property X.
- Therefore A itself has property X.
Why it fails
Some properties add up: if every part is red, the whole is red. Some don’t: every brick is light and the wall is heavy; every player is a star and the team is a mess; every ingredient is tasty and the mixture is dreadful. Parts interact once they’re together; the fallacy ignores the interaction.
How to spot it
- The pattern “each one is… so all of them are…”.
- The parts are praised one by one; what happens when they meet is never asked.
- Nobody checked whether the property adds up: weight does, harmony doesn’t.
What to say
Ask “does this property add up?” Then talk about the coming-together: “How do the parts affect each other?” Keep the counterexample ready: a feather is light; a truckload of feathers isn’t.
When it’s not a fallacy
For properties that add up, the inference holds: if every part is steel the whole is steel, if every part weighs a kilo ten parts weigh ten. The difference is the kind of property. If you don’t know whether the whole behaves differently from its parts, admit that you don’t know.
Examples
- Football“We bought the league’s best player for every position; the title’s certain.” Eleven stars don’t make one team.
- Work“Every department does its own job perfectly, so the company is perfect.” While the departments waited for each other, the customer left.
- Shopping“Every part of this computer is the best available.” If the parts don’t fit together, the best parts make the worst computer.
- Family“We’re all calm people, so we’ll be calm together at the holiday dinner.” We aren’t.