三万年前；当人们在拉斯科（Lascaux）做洞穴绘画时，他们每周工作二十小时，为自己提供食物，庇护所和衣服。剩下的时间，他们可以玩，睡觉，或者做他们想做的任何事情。他们生活在一个自然世界中，有干净的空气，清洁的水，美丽的树木和日落。考虑一下。每周二十小时。
(Thirty thousand years ago; when men were doing cave paintings at Lascaux, they worked twenty hours a week to provide themselves with food and shelter and clothing. The rest of the time, they could play, or sleep, or do whatever they wanted. And they lived in a natural world, with clean air, clean water, beautiful trees and sunsets. Think about it. Twenty hours a week.)