Reckoning with a master of calculation

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Fingers, stones, knots

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How does a computer work?

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Constructivist sculptures

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Reckoning with a master of calculation

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Intuitive und konstruktive Geometrie

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Intuitive und konstruktive Geometrie und Terry Haass im Arithmeum

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Colour, Form and Right Angles

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Learning from a reckoning master

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Calculating with Rods and Slide Rules

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