“ Civilization cannot exist without new frontiers; it needs them both physically and spiritually. The physical need is obvious—new lands, new resources, new materials. The spiritual need is less apparent, but in the long run it is more important. We do not live by bread alone; we need adventure, variety, novelty, romance. As the psychologists have shown by their sensory-deprivation experiments, a man goes swiftly mad if he is isolated in a silent, darkened room, cut off completely from the external world. What is true of individuals is also true of societies; they, too, can become insane without sufficient stimulus.
— Arthur C. Clarke
