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Updated: July 21, 2026
The ur-phenomenon having once been discovered in the heavens, could then easily be found elsewhere in nature on a large or small scale-as, for instance, in the blue of distant hills when the air is sufficiently opaque, or in the colour of the colourless, slightly milky opal which looks a deep blue when one sees it against a dark background, and a reddish yellow when one holds it against the light.
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