The First Book of Mechanical Mathematical Instruments

The page features four faint illustrations, likely architectural or archaeological in nature, arranged in a grid-like fashion.
1. Top left: A tall, triangular or pyramidal structure, possibly an obelisk or monument, with faint indications of surface detail.
2. Top right: A classical column standing on a high pedestal, topped with what appears to be a small statue or ornamental urn.
3. Bottom half: The bottom two sections contain very faint, blurry outlines that suggest architectural ruins or human figures in a landscape, but no specific details are discernible.
The overall condition of the page makes it impossible to read any accompanying text or identify specific subjects.