Synekism and the origin of cities
Recently I have been working on the concept of Urban Revolution and reading a lot on the origin of cities. In the thirties of the past century, the archaeologist Gordon Childe proposed the theory of an urban revolution taking place after the neolithic (that is agricultural) revolution. He analysed archaeological data from ancient cities and reconstructed a sequence in which the existence of a surplus allowed for more complex division of labour and the emergence of cities. The hypothesis is so widely extended that is accepted as a conventional wisdom.