Describing the surreal hallucinations, insomnia and nightmarish visions he experienced while consuming daily large amounts of laudanum, Thomas De Quincey's legendary account of the pleasures and pains of opium forged a link between artistic self-expression and addiction, and paved the way for later generations of literary drug-takers from Baudelaire to Burroughs.

Throughout history, some books have changed the world. They have transformed the way we see ourselves - and each other. They have inspired debate, dissent, war and revolution. They have enlightened, outraged, provoked and comforted. They have enriched lives - and destroyed them. Now Penguin brings you the works of the great thinkers, pioneers, radicals and visionaries whose ideas shook civilization and helped make us who we are.