Five of his novels and several of his short stories take place within one consistent future universe, usually now called the Revelation Space universe after the first novel published in it, although it was originally developed in short stories for several years before the first novel. Although most characters appear in more than one novel, the works set within this future timeline rarely have the same protagonists twice. Often the protagonists from one work belong to a group that is regarded with suspicion or enmity by the protagonists of another work. While a great deal of science fiction reflects either very optimistic or dystopian visions of the human future, Reynolds's future worlds are notable in that human societies have not departed to either positive or negative extremes, but instead are similar to those of today in terms of moral ambiguity and a mixture of cruelty and decency, corruption and opportunity, despite their technology being dramatically advanced.