Classic of Filial Piety
The pailou (ceremonial entrance) of Beilin shelters a stone copy of the Confucian Classic of Filial Piety, with commentary written personally by the Tang emperor Xuanzong. The stele is dated by inscription to 745 AD. Its title is written, as befits its importance, in ancient seal script. The text is inscribed in the later, and more readable, Han clerical script, with Xuanzong's commentary interpolated in the smaller characters.
How was this done? Xuanzong first wrote out his text in ink on paper. Skilled artisans then transferred the characters to stone by scratching through the paper, treating it like a stencil, and finished by carving the stenciled characters in sunk relief.