Tapestry can picture because it is weft-faced: the weft is packed so tightly that it hides the warp and becomes the entire surface the eye sees. Different colors of weft can be worked in separate areas, so the image is built from those yarns rather than from a dye printed on afterward. The opening covers packed weft hides the warp, each color weaves its own area, and discontinuous wefts can leave slits.
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