 After completing "Psychanalyse", Trondheim was challenged by fellow cartoonist Jean-Christophe Menu to write a story with only four panels, drawn by Menu.After some strips, Trondheim asked for four more panels, and wrote the highly dense comic book, "Moins d'un quart de seconde pour vivre".The constrained writing results, reminiscent of OuLiPo writers, became the basis for OuBaPo.