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Sprang
Sprang is an ancient method of constructing fabric that has a natural elasticity. Its appearance is similar to netting, but unlike netting sprang is constructed entirely from warp threads. Archaeological evidence indicates that sprang predates knitting; the two needlework forms bear a visible resemblance and serve similar functions but require different production techniques.
Although examples of sprang have been unearthed from as early as the bronze age, sprang was almost entirely undocumented in written records until the late nineteenth century when archaeological finds generated interest in Europe. Museum examples of sprang had been misidentified as knitting or lace until discoveries of ancient examples prompted reexamination of newer pieces. Subsequently, sprang has been identified in a variety of cultures and traditions across several continents. Its practice as a folk art waned during the twentieth century and sprang traditions have disappeared in most locales. Knitting has largely supplanted sprang.
==Technique==
In principle, sprang may be regarded as a practical application of the fiber manipulation techniques used in the children's game known as cat's cradle. Sprang is made by preparing a set of warp threads either on a rectangular frame or between a pair of beams. The craftsperson then generates a fabric by interlinking the warp threads. Unlike most textile production techniques that add new rows at the end of completed rows, sprang works upon the center of a group of fibers and the material grows inward from both ends with symmetrical top and bottom halves. The craftsperson must maintain control of the center area or the structure unravels: most sprang worked upon has too many fibers to keep in hand, so rods or sticks maintain the appropriate fiber positions. The fiber manipulation itself is done by the craftsperson's fingers. Decorative patterns may be generated by regular variations in the fiber crossings. As crossings accumulate the craftsperson beats the material flat with a stick.〔 Work continues with the material growing from both edges toward the middle until the center band becomes too tight to continue work. The completed fabric is either separated into two identical items or permanently secured at the middle to stabilize the contrary twists.〔 In traditions where two halves of sprang are not severed by cutting, this center seam is a telltale sign of sprang manufacture.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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