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The a s'agu (needle), a mustra 'agu technique is a base fabric technique that requires the use of additional wefts to weave the pattern, manually drawn by the weaver.
More specifically, the term is used to describe two versions of the same technique:
in the first version, referred to as a s'agu, or a mustra 'e agu, additional one-coloured wefts are drawn from selvedge to selvedge with the use of a long wooden needle (s'agu), on which the thread is wound;
in the second version, that is referred to as a s'agu a colorese, a s'agu coloradu, the additional many-coloured wefts are drawn locally on the motif.
In both cases, the additional wefts are woven on a base canvas fabric in neutral colour, counting warp threads, following a pattern inspired by existing samples or technical drawings.