A barometer measures atmospheric pressure. It can forecast short-term changes in the weather, even when it looks as if conditions are stable, with no sign of a change coming. The barometer might predict rain on a bright sunny day, or sunshine when it's cloudy and dark, defying what you might guess would happen.

Mary Baker Eddy discussed this phenomenon in Science and Health: "The optical focus is another proof of the illusion of material sense. On the eye's retina, sky and tree-tops apparently join hands, clouds and ocean meet and mingle. The barometer,—that little prophet of storm and sunshine, denying the testimony of the senses,—points to fair weather in the midst of murky clouds and drenching rain. Experience is full of instances of similar illusions, which every thinker can recall for himself" (p. 122).

August 18, 2008

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