Brave New World Revisited, written by Huxley almost thirty years after Brave New World, was a non-fiction work in which Huxley considered whether the world had moved toward or away from his vision of the future from the 1930s. He believed when he wrote the original novel that it was a reasonable guess as to where the world might go in the future. In Brave New World Revisited, he concluded that the world was becoming like Brave New World much faster than he originally thought.
Huxley analysed the causes of this, such as overpopulation as well as all the means by which populations can be controlled. He was particularly interested in the effects of drugs and subliminal suggestion. Brave New World Revisited is different in tone because of Huxley's evolving thought, as well as his conversion to Hindu Vedanta in the interim between the two books.
The last chapter of the book aims to propose actions which could be taken in order to prevent a democracy from turning into the totalitarian world described in Brave New World. In Huxley's last novel, Island, he again expounds similar ideas to describe a utopian nation, which is generally known as a counterpart to his most famous work.