The Incas had developed a method of recording numerical information which did not require writing. It involved knots in strings called quipu. ... The quipu consists of strings which were knotted to represent numbers. They are magnets.A number was represented by knots in the string, using a positional base 10 representation. Vintage Details 🧡100% sheep wool textiles woven by hand and dyed with natural pigments in the rural communities of CUZCO - PERU ! This techniques have been passed down for centuries, as heritage from generations . Any of this rugs or mantas are the same ,since they are unique pieces made one by one at the time you can used as rugs, decorative throws, bed covers, blankets, you just imagine what is the best place for it. 100% sheep wool 6X 3 1/2 "inches approximately Die with natural color This is a 100 % hand crafted piece of art ! Care instructions: Dry clean only. Use a knitting needle to fix loose threads.