The archives have kept a sketchbook by Céline, in the same format as Thérèse's.
It opens with sketches made by a 16-year-old Céline, and probably ends the following year.
She begins it at the same time as her cousin Marie, both in tune with Thérèse.
Céline leaves it for a few hours to Abbé Lepelletier, who notably leaves us a beautiful drawing of the Martin girls (see after the perspective study pages).
