Illustrated book

Two pages from an illustrated book by an unknown artist, showing technical drawings of a wooden structure. The pages are open to reveal two side-by-side drawings. The left drawing shows a structure with a flat base and top, two vertical side panels, and two inner diagonal crossed supports. The right drawing shows a structure with a flat base, a flat top with an overhang, two vertical side panels, and an inner vertical support. Both drawings are in black ink on a beige background. Chinese characters appear at the top and bottom of each drawing. The pages have a decorative border with curved corners. The pages show signs of wear, with darker edges and a small dark smudge on the left page.