This game challenges both your logic abilities and your visual perception at the same time using “Quipus”.
Quipus were devices used by the Incas and the Andean civilization for recording information (for accounting purposes), consisting of variously coloured threads knotted together in different ways
How to play
You must discover which one of the three proposed quipus (A, B or C) is identical to the quipu within the frame, following one simple rule: two quipus are considered identical if we can convert one to the other by rotation of the threads around the knots (fig. 1), without lifting them or turning the quipu over (see examples in fig. 2).
Gianni, founder of Archimedes' Lab Project™ has written an extensive collection of books in several languages on brain training, critical thinking, visual art, and on the mechanism of vision.