The Incas had a system of accounting that relied on the quipu. Cords of various colours were attached to a main cord with knots. The number and position of knots as well as the colour of each cord ...

as well as the fact that Inca history itself is told non-linearly. But we do know that they used Andean accomplishments, from architecture to knotted quipu, to create a city that ruled the largest ...