Un peintre sur trois

All the illustrations in this curious ms. are painted sideways, so we need to turn our head – sorry about that. But I don’t think that’s the only problem here.

Bartholomaei Minoritae , Mantuani, ad Ludovicum Gonzaïcum liber de memoria artificiali : subjiciuntur hominum, animalium, aliorumque id genus figurae
Source: gallica.bnf.fr

Bibliothèque nationale de France, Département des manuscrits, Latin 8684, fol. 19r.