For the bear René, philosophy is his greatest passion when he is not busy with hibernation or foraging for food. His captivity in the zoo suits him perfectly. Finally, he has the time and leisure to ponder the fundamental nature of existence. He owes his stability to his friend Marin, a lively and precocious raccoon. Together, the two explore the small and large mysteries of rationalism. In a humorous yet enlightening manner, Thomas Wellmann offers us a brief excursion into the foundations of philosophy, inspired by René Descartes.