I was able to find the 1493-1494 edition of the mystery play that Jean Michel reportedly authored. Apparently he was the Mel Gibson of his time. It is in the Bibliothèque nationale de France (visit here). Le Mystère de la Passion is a printed book which is embellished really beautifully.
First thing I noticed was that the end of the lines were filled with painted decoration for aesthetic purposes which reminded me of the presentation of Prescott Currier on the Voynich Manuscript (read here ). He explained curious detail about the line in the VMS as functional entity:
"...The ends of the lines contain what seem to be, in many cases, meaningless symbols: little groups of letters which don’t occur anywhere else, and just look as if they were added to fill out the line to the margin..."Could the explanation be that the text is poetry?
The flowers that are painted in the Passion play book are very humble ones. One particular thistle caught my eye because it was shaped to fit inside Fleur-de-lis symbol, which reminded me of the VMs fol. 13r.