All Horses are the Same Colour/Historical Note

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Historical Note on All Horses are the Same Colour

The paradox All Horses are the Same Colour was originally raised by George Pólya, and appears in his $1954$ work Induction and Analogy in Mathematics.

It arose from the popular (at the time: the 1930's) colloquialism:

That's a horse of a different color!

meaning:

That's unexpectedly new and different.