The Culture is a fictional interstellar post-scarcity civilisation or society created by the Scottish writer Iain Banks and features in a number of his space opera novels and works of short fiction, collectively called the Culture series. In the series, the Culture is composed primarily of sentient beings of the humanoid alien variety, artificially intelligent sentient machines, and a small number of other sentient "alien" life forms. Machine intelligences range from human-equivalent drones to hyper-intelligent Minds. Artificial intelligences with capabilities measured as a fraction of human intelligence also perform a variety of tasks, e.g. controlling spacesuits. Without scarcity, the Culture has no need for money; instead, Minds voluntarily indulge humanoid and drone citizens' pleasures, leading to a largely hedonistic society. Many of the series' protagonists are humanoids who have chosen to work for the Culture's diplomatic or espionage organs, and interact with other civilisations whose citizens act under different ideologies, morals, and technologies.