Neat News 681 (added 2017-11-11)
Ancient String Code

Public Domain by Felipe Guaman Poma de Ayala
In the Inca Empire a form of records was kept which consisted of strings in different colours, fibre types - which can be distnguished by touch -, and directions of ply. It was assumed that the knowledge of the so-called khipus was lost, but from different sources it may be possible to decipher them.