Example image of eyePlorer eyePlorer map for 'Civilization': Class stratification Complex society Division of labour Sovereign state Albert Schweitzer Ethics Materialism Ancient Rome Civil law (legal system) Justinian I Corpus Juris Civilis Bologna University Western Europe Barbarian James Boswell Oxford English Dictionary Samuel Johnson Adam Smith The Wealth of Nations Honoré Gabriel Riqueti, comte de Mirabeau Vere Gordon Childe Literacy Agriculture Crop rotation Irrigation Cereal Food storage Artisan Priest Bureaucracy Government Ruling class Conflict theory Elman Service Morton Fried Social inequality Egalitarianism Hunter-gatherer Horticulture Pastoralism Chiefdom Ownership Landed property Market Tariff Tax Tithe Trade Tribute