Lefebvre argued that everyday life was an underdeveloped sector compared to technology and production, and moreover that in the mid 20th century, capitalism changed such that everyday life was to be colonized—turned into a zone of sheer consumption. In this zone of everydayness (boredom) shared by everyone in society regardless of class or specialty, autocritique of everyday realities of boredom vs. societal promises of free time and leisure, could lead to people understanding and then revolutionizing their everyday lives. This was essential to Lefebvre because everyday life was where he saw capitalism surviving and reproducing itself. Without revolutionizing everyday life, capitalism would continue to diminish the quality of everyday life, and inhibit real self-expression. The critique of everyday life was crucial because it was for him only through the development of the conditions of human life—rather than abstract control of productive forces—that humans could reach a concrete utopian existence.