For decades Sarah drew hollow-eyed, gaping faces on Bristol cards. These faces without bodies or sex emerged from blank backgrounds: unworthy stains furiously crossed out and scratched, if not erased. When she died in 1994, her close relatives found several hundreds of these enigmatic drawings. Philippe Boutibonnes, with whom she maintained a long correspondence and who owns several of these drawings, reads with his fingers and tells with his words the outlines drawn by Sarah. He remembers their last moments together. Do the staring faces unveil some secret of the philosopher? Sarah never drew a self-portrait, but if the hundreds of precarious and unstable faces come to be superimposed, her face might appear.