A simple loom known in pre-Columbian America and in Asia and still used in western Mexico, Guatemala, and other places in Central America. A continuous warp thread passes between two horizontal poles, one attached to a support and the other to a seated weaver, who adjusts the tension by moving forwards or backwards. The Navajo Indians wove blankets on a two-bar loom for centuries. Throughout the Caroline Islands (except Palau), strips of banana and hibiscus fiber are woven on backstrap looms.