Weighing flies, eggs in cobweb scale: Voltaire's venomous characterization still sticks to Marivaux's oeuvre today. In opposition to that view, this course takes a deeper look into the seeming glibness and shallow sophistication of the marivaudage, to consider it as an exploration of the potentialities and perils of language. Do words help us to express ourselves, or are they a hindrance? Is language itself a disguise? Is disguise the most authentic way to be? Is the quest for authenticity a futile one? We examine how Marivaux's exploration of these questions let him innovate in multiple genres, from plays to novels and journalism.