Twenty-five or so years ago when I lived in Amsterdam, I enjoyed browsing design books, including one devoted to tittles.
The book basically showed the wide variety of tittle shapes above the stems in different fonts.
I think the title was something like "Het Punt boven de I" (or is it het i?) -- in English, something like "The Dot above the I".
I have been unable to find mention of the book online, and a designer friend in Haarlem could not recall the book.
Might anyone know the correct title and author? And do I remember correctly that the small book had a yellow cover?