It is said that our Northern Hemisphere ancestors were familiar only with white swans. When they sat round the fire talking about the swans they had seen, there was no need to specify the colour: The mere concept of a black swan was absurd.

However, sometimes these things are a matter of perspective. I happen to come from a land Down Under where Christmas is in summer, where mothers hop around with their young in a pouch, where spiny mammals lay eggs, and where the swans are most distinctly black. And so it was many years before I first saw a white swan.

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