Saris are woven with one plain end (the end that is concealed inside the wrap), two long decorative borders running the length of the sari, and a one- to three- foot section at the other end which continues and elaborates the length-wise decoration. This end is called the pallu; it is the part thrown over the shoulder in the Nivi style of draping. In past times, all saris were hand woven of silk or cotton, and represented a considerable investment of time or money. Sometimes warp and weft threads were tie-dyed and then woven, creating ikat patterns, or threads of different colors were woven into the base fabric in patterns; an ornamented border, an elaborate pallu, and often, small repeated accents were woven in the cloth itself. For fancy saris, these patterns could be woven with gold or silver thread (zari work). Sometimes the saris were further decorated, after weaving, with various sorts of embroidery, pearls and precious stones. Modern saris are increasingly woven on mechanical looms and made of artificial fibers, but hand-woven saris are still popular for weddings and other grand social occasions.