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Because few books or drawings existed at the time, apprentices would learn the trade by watching Masters and imitating them as closely as possible.
FORBES: Why Apprenticeships Are the Fastest Way to Acquire Skills
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The craftsmanship is passed on orally and through personal demonstration, or from one generation to another by masters teaching apprentices or relatives within a clan in accordance with strict procedures.
UNESCO: Culture
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The technique is mainly passed from fathers to children or from masters to apprentices strictly following ancient Buddhist painting books that provide instruction on line and figure drawing, colour matching and pattern design.
UNESCO: Culture