This is a detailed black and white engraving depicting a scientific illustration of a camera obscura in action. The scene is set before a stone castle and a walled town. A camera obscura, a dark box with a small hole, is positioned in front of the castle. Light rays (labeled A, B, and C) are shown entering the hole in the camera obscura. These rays pass through the hole and project an inverted image of the castle onto a screen inside the box. The screen is labeled with letters (Q, R, S, T). The illustration is labeled with letters and lines to explain the path of light. The background shows a landscape with buildings and a hill. The top of the image has the title 'FIGURA XI' and 'Fig. XI'. Below the image is a line of Latin text. The style is reminiscent of early scientific illustrations, with detailed linework and a focus on demonstrating a principle of optics.