Drawing of camera obscura and face projection

Photograph of a page with a drawing of a camera obscura. Depicted is an architectural structure with an open aperture, inside which there is a small human figure. Lines are drawn from the figure to the aperture, showing the projection of the person's face in an enlarged view to the left of the structure. Above the drawing is handwritten text in Latin. Below the drawing is the caption "Fig. 1. Camera obscura Gemma Frisius."