This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

A woodblock illustration depicts a defensive military structure. At the top, a technical diagram shows an "Arrow-Shielding Rack," consisting of two vertical wooden posts connected by horizontal beams and supported by diagonal braces. Below the diagram, a scene shows the practical application of these racks on a city wall. Three soldiers wearing traditional Ming-style helmets are visible behind the battlements. Large rectangular fabric or hide screens are suspended from the wooden racks to protect the defenders from incoming arrows. The base of the wall is depicted with horizontal lines representing either the masonry or a moat.