“Mathematical and physiological researches have shown that the space of experience is simply an actual case of many conceivable cases, about whose peculiar properties experience alone can instruct us.”

—  Ernst Mach

Source: 20th century, Popular Scientific Lectures, (Chicago, 1910), p. 205; On the space of experience.

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Ernst Mach photo
Ernst Mach 12
Austrian physicist and university educator 1838–1916

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