In this scene Urky has stolen a manuscript by Rabelais & I tried to suggest the master's signature, very loosely based on a letter in which he signs his name in the Latin form, Rabelesus (obligingly including a "u"), but please don't try to make sense of my Latinoid scribbles otherwise! Also, I couldn't really remember Urky's physical description, so forgive me if I'm way off-- I just didn't have time to reread the whole book.
I did my best to make the whole figure (including ms.) form a certain letter, though... do "u" see it? ;-)
Acrylic on text scanned from a 1983 Penguin paperback.