All cultures change - but some aspects change more rapidly than others. Drawing on extensive experience of various cultures, in this book David Lewis develops a model that differentiates between the rates of change in different aspects of a culture.Culture teaches us how to relate to other human beings, so David also explores aspects of what it means to be human. Some distinctively human features that are influenced by culture include the development of a sense of humour, a sensitivity to the voice of one's conscience and a capacity to look towards the future with hope.