Therefore it is a great valuefor fixing a memory-image that when we read books, we strive to impress onour memory through the power of forming our mental images not only thenumber and order of verses or ideas, but at the same time the color, shape,position, and placement of the letters, where we have seen this or that writ-ten, in what part, in what location (at the top, the middle, or the bottom)we saw it positioned, in what color we observed the trace of the letter or theornamented surface of the parchment
I've always been able to generally remember how far into a book and on what part of the page (left/right; top/middle/bottom) the thing was. This obviously is not a new phenomenon, though obviously the printing of texts in the modern age helps standardize this for students in comparison with this particular example which discusses different versions of the same text.