by the invention of modern and innovative designs, woven in the centuries-old technique. Hand-woven Persian rugs and carpets have been regarded as objects of high artistic and utilitarian value and prestige since the first time they were mentioned by ancient Greek writers. Although the term "Persian carpet" most often refers to pile-woven textiles, flat-woven carpets and rugs like Kilim, Soumak, and embroidered tissues like Suzani are part of the rich and manifold tradition of Persian carpet weaving. In 2010, the "traditional skills of carpet weaving" in Fars Province and Kashan were inscribed to the UNESCO Intangible Cultural Heritage Lists. History The beginning of carpet weaving remains unknown, as carpets are subject to use, deterioration, and destruction by insects and rodents. Woven rugs probably developed from earlier floor coverings, made of felt, or a technique known as "flat weaving". Flat-woven rugs are made by tightly interweaving the warp and weft strands of the weave to produce a flat surface with no pile. The technique of weaving carpets further developed into a technique known as loop weaving. Loop weaving is done by pulling the weft strings over a gauge rod, creating loops of thread facing the weaver. The rod is then either removed, leaving the loops closed, or the loops are cut over the protecting rod, resulting in a rug very similar to a genuine pile rug. Hand-woven pile rugs are produced by knotting strings of thread individually into the warps, cutting the thread after each single knot. The Pazyryk carpet: Earliest pile-woven carpet The Pazyryk carpet was excavated in 1949 from the grave of a Scythian nobleman in the Pazyryk Valley of the Altai Mountains in Siberia. Radiocarbon testing indicated that the Pazyryk carpet was woven in the 5th century BC. This carpet is and has 36 symmetrical knots per cm2 (232 per inch2). The advanced technique used in the Pazyryk carpet indicates a long history of evolution and experience in weaving. It is considered the oldest known carpet in the world. Its central field is a deep red color and it has two animal frieze borders proceeding in opposite directions accompanied by guard stripes. The inner main border depicts a procession of deer, the outer men on horses, and men leading horses. The horse saddlecloths are woven in different designs. The inner field contains 4 × 6 identical square frames arranged in rows on a red ground, each filled by