Rather than Plato’s innate ideas I think the concept of categories is a more correct model. We categorise things (physical and concepts) according to perceived like-ness and difference.

As a child I had thought dogs, lions, and tigers were of the same category (fierce and scary animals). So it was a shock when I had learned that lions and tigers are related to cats, and genetically unrelated to dogs, apart from being a mammal, of course. It was a shock to me too that humans are mammals.

There are no natural categories. We make choices from obvious (and sometimes not so obvious) traits, whatever that word means.

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