2012/9/5 Leo Broukhis <[email protected]>: > The magnification of the attached fragment is about 2x compared to > what it was on the calendar page if viewed on a 100 dpi display. > There are only two pages surviving, and the second one doesn't have that > symbol. > > Ctrl-+ while viewing the attached image should help. > > I can see quite clearly that there is an arrow-like shape pointing to > the upper-right corner.
In my opinon the shape visible inside a a side effect of the paper texture, with inking defects the same size as those visible on the surrounding letters. My opinion is that the symbol inside the large square is a central square dot normally completely filled. Just consider how the top-left corner of the outer square is partially drawn (it was clearly intended to have a regular thick stroke width) : the missing ink is even larger than the smaller defects on the central shape.
