These imaginative thought experiments are the inventions of one of the world's eminent brain researchers. These imaginative thought experiments are the inventions of one of the world's eminent brain researchers. They are" vehicles," a series of hypothetical, self-operating machines that exhibit increasingly intricate if not always successful or civilized" behavior." Each of the vehicles in the series incorporates the essential features of all the earlier models and along the way they come to embody aggression, love, logic, manifestations of foresight, concept formation, creative thinking, personality, and free will. In a section of extensive biological notes, Braitenberg locates many elements of his fantasy in current brain research.