Anderson is best known for his 1983 book, "Imagined Communities: Reflections on the Origin and Spread of Nationalism", in which he examined how nationalism led to the creation of nations, or as the title puts it, imagined communities. In this case, an "imagined community" does not mean that a national community is fake, but rather refers to Anderson's position that any community so large that its members do not know each another on a face-to-face basis must be imagined to some degree.