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.

Any questions or comments?

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