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Originally published in 1957, this volume compares the 20th Century transformation of human life to the revolution which swept early man into the first civilized communities. It shows how each radical new stage of human development grew out of changes in human personality and consciousness, such as the invention of language and symbols, the origins of universal religions and the mechanization of everyday life. Despite the threat that the author foresees from an over-reliance on automation, the book maintains that humanity still has the means, spiritual, personal and technological to create a sustainable future for itself, by increasing the usefulness and freedom of all men.