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Essentialism and such (was a bunch of previous subject lines)
>> Triangles can take on an infinite number of variations in dimension
>> and proportion, for example, and still remain perfect triangles.
>But they can't gain or lose a corner.
>Not so with organisms. Tetrapods can lose all four limbs and stay
>Why? Because there are descended from tetrapods. There is an essence,
>but it is descent, not any merely three->dimensional quality. There is
>no way to ignore time in this question. Tree-thinking.
Hmm... I smell circularity (or is it a circle?) here...