"The twentieth century will be chiefly remembered by future generations not as an era of political conflicts or technical inventions, but as an age in which human society dared to think of the welfare of the whole human race as a practical objective." - Arnold Toynbee, English historian(1889-1975). The word "practical objective" here shifts the utopian ambition of human welfare,which by definition is not reachable, to a design project, a practical objective.