Weaving involves the crossing of a row of parallel threads called the warp (threads running vertically) with another row called the weft (threads running horizontally). A horizontal loom, constructed with wood, consists of a set of two, four or six heddles (loops for holding thread), which are used for separating and guiding the warp threads. These are attached to treadles (foot pedals) with pulleys that have spools of thread inserted in them. The pulleys can be used to move the warp threads apart. As the weaver divides the warp threads, he uses a shuttle (a small wooden device carrying a bobbin, or small spool of thread) to insert the weft threads between them. These various parts of the loom, like the motifs in the cloth, all have symbolic significance and are accorded a great deal of respect.