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As Doris Lessing discusses in her own introduction (new for this edition), her best-known and best-selling novel has been viewed as being "about" various things: the battle of the sexes and man's inhumanity to woman; mental health; the difficulties facing left-wing politics following the failure and collapse of communism. As she herself points out, there is a definite irony in this, given that her central theme and premise was the need to see things as a whole and avoid compartmentalising different aspects of our lives (love life, family life, political life, work life etc. etc.). This remains a startling idea: what Lessing is essentially saying is that it is just this sort of compartmentalising that allows an otherwise kind character to be a shameless racist (there is a prominent example in the Black Notebook), or an operative of a totalitarian regime to commit acts of genocide then go home to a peaceful family dinner.