Optical Anisotropy and Ritual Mask Polishing in Bhutanese Cham Dance Conservation

光学各向异性与不丹恰姆舞面具抛光仪式的科学内涵

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Bhutanese cham dancers meticulously polish wooden masks using layered plant resins that alter surface birefringence under ritual lighting.
This polishing protocol exploits natural anisotropic scattering to enhance facial expression visibility during low-illumination monastery performances.

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