From "Teaching about Inca Children & Families, Libby VanBuskirk." Two children are making a loom for weaving. The process is called "warping" or "setting the warp." In Inca back-strap weaving a new loom has to be made for each new project. Painting by Angel Callanaupa Alvarez, illustrator of the upcoming book "Beyond the Stones of Machu Picchu: Folk Tales and Stories of Inca Life."