Traditional Navajo weaving used upright looms with no moving parts. Support poles were traditionally constructed of wood; steel pipe is more common today. The artisan sits on the floor during weaving and wraps the finished portion of fabric underneath the loom as it grows. The average weaver takes anywhere from 2 months to many years to finish a single rug. The size greatly determines the amount of time spent weaving a rug. The ratio of weft to warp threads had a fine count before the Bosque Redondo internment and declined in the following decades, then rose somewhat to a midrange ratio of five to one for the period 1920-1940. 19th-century warps were colored handspun wool or cotton string, then switched to white handspun wool in the early decades of the 20th century. (wikipedia)