Editor's Note:
Du Weisheng, 65, restores ancient books and texts at the National Library of China. Du has more than 40 years of experience in restoration. Photos: VCG
Damaged portions are only visible with a lightbox table. Photo: VCG figcaption > Du Weisheng lays out an ancient architectural plan across a work station. Photo: VCG figcaption > Pictured is an ancient architectural plan. Photo: VCG figcaption >