'The creatures outside looked from pig to man, and from man to pig, and from pig to man again; but already it was impossible to say which was which.'When the downtrodden animals of Manor Farm overthrow their master Mr Jones and take over the farm themselves, they imagine it is the beginning of a life of freedom and equality.

Soon the other animals discover that they are not all as equal as they thought, and find themselves hopelessly ensnared as one form of tyranny is replaced with another. Animal Farm was one of George Orwell's most successful books - after its publication Orwell became one of the best-paid writers in England.

Though the text continues to play a foundational role in the political education of young people across the world, its allegorical function has become more difficult to decode as the U.S.S.R recedes into the historical distance.