Figure 6.
The grid presents twelve images of old book components arranged in three rows of four. The first row shows a worn guard leaf with stamps, a printed page with text, a blank leaf, and a stained back board. The second row shows a plain page, another blank leaf, a dark worn board, and another blank guard leaf. The third row shows a printed text page, a dark textured board, and a blank page. Each image includes Italian labels describing parts of historical book structures such as guard leaves, pages, frontispieces and boards, with some labels repeated above and below the images.Error recognition
Source: Figures courtesy of University of Bari Aldo Moro