A cross-section illustration of a large, domed structure, likely a cathedral or monumental building, showing its internal architecture. The main view is a vertical cutaway revealing multiple levels: a central nave with a tall, ribbed vaulted ceiling, flanked by aisles and side chapels. The floor is wooden, and the walls are lined with stone or brick. A large, arched window or clerestory is visible at the top. In the foreground, three small human figures stand on the ground, providing scale. A smaller inset diagram at the bottom right shows a cross-section of the dome’s curvature and construction layers, including the barrel vault and supporting ribs. The entire structure rests on a textured ground surface, suggesting earth or stone. The style is detailed, hand-drawn, with hatching and shading for depth, characteristic of architectural illustrations by David Macaulay.