Buridan's ass is an illustration of a paradox in philosophy in the conception of free will.
It refers to a hypothetical situation wherein an ass (donkey) that is equally hungry and thirsty is placed precisely midway between a stack of hay and a pail of water. Since the paradox assumes the donkey will always go to whichever is closer, it dies of both hunger and thirst since it cannot make any rational decision between the hay and water. A common variant of the paradox substitutes the hay and water for two identical piles of hay; the ass, unable to choose between the two, dies of hunger.
Political cartoon c. 1900, showing the United States Congress as Buridan's ass (in the two hay piles version), hesitating between a Panama route or a Nicaragua route for an Atlantic–Pacific canal.
Jean Buridan was an influential 14th‑century French philosopher.
Jean Buridan
14th-century manuscript of Buridan's Questions on Aristotle's De anima.