A ryijy (Swedish rya) is a traditional Scandinavian wool rug with a long pile of about 1 to 3 inches. They were created using a form of the Ghiordes knot to make the double-sided pile fabric. The first ryas originated in the early fifteenth century as coarse, heavy covers used by mariners instead of furs. As time progressed, the rugs have evolved to be lighter and more colorful. Each knot is composed of three strands of wool, which enables the carpet to exhibit rich texture from all the different shades of color.