From an early age, we learn to count, we use tools like the abacus, maybe even a calculator, and we learn the multiplication tables by heart. Counting is difficult, despite the fact that each object is only assigned one word. We can make a tally list or use complicated algebraic laws: the world of numbers is infinite. No one knows exactly who invented mathematics, it is probably a joint creation by many cultures on this earth. And yet numbers are abstract and culturally shaped constructs. This becomes clear in the example of the number concept of the Pirahā tribe (Papua New Guinea), which comprises only three words: one, two and many. How we count influences us, our thinking and above all our realities of life.
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