Tablet weaving is a textile technique for band weaving used from prehistoric times till this day. Archaeological finds show us, that the technique was highly developed in the Iron- and Viking Ages. Nowadays we often have difficulties figuring out how certain finds were produced originally.
Often the tiny fragments found in an archaeological context show patterns, which must have required a high level of abstraction and degree of mathematical ability to produce; and features like mistakes, omissions or irregularities often reveal to what degree the weaver mastered the technique.
This web site contains information about research into this ancient technique.