The Increments of Visibility

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2026-06-02 00:22:10 -

The fog on the Edinburgh-to-Glasgow line is not a binary condition. It is not present or absent, thick or thin, visible or invisible. The fog is a spectrum. It exists in degrees. At its thickest, visibility is zero—a man cannot see his own hand at arm's length, cannot distinguish the rail from the air, cannot tell where the train ends and the darkness begins. At its thinnest, visibility is a...

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