Shortsighted critics seem to imagine that the fictional material merely illustrates what Laborit says, although Resnais inserts some jokey shots of 'human' mice to demolish any such notions. His triumph is to create a new kind of fiction: a drama that not only leaves room to think, but opens up fissures that thoughts flood into, some prompted by Laborit, others by personal reflections, yet others by dreams. Inevitably, it ends in a riddle, and one which proves that surrealism lives.