Stimulated Variation and Cascades: Two Processes in the Evolution of Complex Technological Systems

Michael Schiffer’s theoretical and methodological contributions to archaeology are substantial. For the last two decades, Schiffer has become increasingly interested in the history of electrical technology, including portable radios, electric automobiles, eighteenth-century electrostatic technology, and, most recently, nineteenth-century electric light and power systems. Schiffer has long held a behavioral view, which focuses analytical attention on interactions between humans and material things, including complex technological systems (CTSs). For Schiffer, two key aspects of the evolution of CTSs are stimulated variation, defined as an increase in invention resulting from changing selective conditions, and cascading, defined as sequential spurts of invention that occur through the recognition of emergent performance problems in a CTS. To attain maximum usefulness, these concepts should be placed in a modern evolutionary framework that correctly identifies, and does not oversell, the role played by cultural selection. Research on individual and social learning provides the critical link between Schiffer’s stimulated variation and cascade models and the diffusion of CTSs.     

The morality of transnationalism: children of Ukrainian labor migrants write about migration,homeland and abroad

Ukraine has experienced a wave of labor migration after the dissolution of the Soviet Union. A large number of Ukrainian children have been directly affected as they grow up in transnational households with one or both parents working abroad. In this article, I aim to describe how Ukrainian children and youth conceptualize migration, homeland and abroad in a context of societal, economic and political change. The analysis is mainly based on a qualitative reading of 143 texts written by Ukrainian children. I argue that Ukrainian children and youth place homeland and abroad on a moral map of belonging, and that migration is conceptualized within such a framework as a morally ambiguous movement.     

Mountain recreation in the East Grampians

Extracts from the results of a year‐long study of mountain recreation in the East Grampians are briefly summarised. Visitor profiles and activity patterns are sketched, and attitudes explored. High levels of satisfaction and enjoyment were reported, but the numbers of persons present gave rise to a sense of loss of wildness on the part of a substantial minority of mountain users.     

Research article

The Peace Mission Movement, an American intentional religious community founded by the Revd M. J. Divine, also known as “Father Divine,” expressed through an intentional use of architecture their own quest for a utopian perfection of consciousness in America. What is especially significant about this expression of perfection is that they did not seek it by building environments of their own creation. Instead, the movement and its leader created a unique religious vernacular architecture not by architectural design, but by a spiritualised appropriation of existing spaces. Through purchasing, restoring, re‐using, and preserving many different types of American domestic and commercial structures, Father Divine and his followers developed a theology of material culture and historic preservation that expressed a major theological perspective of their belief system—to spiritualise the material and to materialise the spiritual—all in the service of God and for the transformation of human nature.