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Isidore of Seville in On the Nature of Things XI, 1 presents the threefold nature of the four elements: fire is acute, subtle and mobile; air is subtle, mobile and obtuse; water is mobile, obtuse and corpulent; earth is obtuse, corpulent and immobile. This (Neo-)Platonic teaching on elements is based on Plato’s dialogue Timaeus. Isidore’s On the Nature of Things was relatively often copied in the...